Common Cannabis Seedling Problems

The cannabis plant is at its most fragile and vulnerable state as a seedling, making the growing stage prone to several problems. If you fail to take care of your marijuana seedlings during this critical stage, you will start with unhealthy looking plants that will affect the growth and future yields.

Of course, before planting, you have to ensure that the seedlings you have are from a reputable seller to avoid buying weak seeds that will give you problems from start to finish. To be on the safe side, if you are a beginner, you should buy your seedlings from any of the reputable online seedbanks.

Seedlings start with two cotyledons, already formed inside the seeds but open up after sprouting. After the cotyledons, other cannabis leaves start growing from the middle of the cannabis seedling. The leaves continue to look more like the cannabis leaves you are familiar with, as they get older.

Cannabis Seedling Problems

During this stage, you need to be extremely careful about how you handle the delicate plants if you want them to continue with healthy growth. The most common cannabis seeding problems that could change the healthy growth are overwatering, underwatering, light, nutrient, and temperature issues.

An experienced cannabis grower can easily avoid these issues, but for a newbie growing cannabis for the first time, this article explains the cannabis seedling problems you may encounter.

Most common cannabis seedling problems

1. Overwatering

Overwatering

Overwatering has more to do with the lack of oxygen than it does with burdening the seedlings with too much water. The most common symptoms of overwatered plants are droopy seedlings, moist medium, and damping. The symptoms mostly show themselves in hydroponic systems where plans grow exclusively in water.

The plant roots, immersed in water, use up the available oxygen, and they remain fine as long as they get enough of it in circulation.  If they use all the oxygen, they start to droop without wilting and showing all the other oxygen deprivation symptoms.

One of the leading causes of overwatering is planting the seedling in a large pot. A large pot holds more water that takes longer to dry out, which becomes a problem considering seedlings do not absorb too much water. Instead of using a large container for your seedling, you should start with a much smaller one that does not hold too much water.

Using a smaller pot helps the plants to grow faster.  You can change to a larger container later after the seedlings start to display significant growth. If, by any chance, you do not have any other choice but to grow your seedling in a large pot, do not panic because you can adjust the watering methods to prevent overwatering.

The following methods will help to prevent overwatering when using a large pot:-

  • Use smaller amounts of water to water the plant.
  • Using a circular motion, pour the water into the pot.
  • You also need to make sure that the top layer of the soil does not contain any moisture or dampness before resuming your next watering cycle.

On the other hand, using a small pot for a large seedling is also not a solution, and you will end up with the same weak plants. Using a small container leads to plants with bound roots. The plants later develop strange symptoms that include discoloration, nutrient deficiencies, and drooping. Root bound happens when roots wrap themselves outside the container without providing water with an escape.

Lack of drainage is also a huge problem as it prevents water from moving from the container to the soil freely. If you are using clay-based soil as your growing medium, you may encounter a few occasional overwatering issues. Ensure that the bottom of container you use for your seedlings has enough drainage holes. You should also make sure the drainage holes are devoid of any clogging for better drainage.

Another cause of overwatering is frequent watering of the seedling. Before adding any water to the container, you need to make sure that the soil is dry for the roots to get an adequate oxygen supply. Roots absorb oxygen in the water quickly, which is why they need to survive by having enough air pockets. One way of ensuring that the growing medium retains more oxygen is by using a potting mix such as perlite.

Another way of increasing air in the soil is by using air or smart pots that allow air in through the sides. You can also reduce overwatering by providing the seeds with less water, especially during the low and colder temperatures.

Bestseller No. 1
Smart Pot RCT10H 17010 Fabric Pot, 10 Gallon, Tan
  • Assembly not required
  • Made in United States
  • Size: 10-Gal
  • Developed for, and used by commercial tree growers
Bestseller No. 2
Smart Pot Soft-Sided Fabric Garden Plant Container Aeration Planter Pots, 5 Gallon, 5 Pack, Black
  • High quality plants grow in less time
  • Roots stay cooler during hot weather
  • Reusable, inexpensive, light weight, attractive and simple design
  • Plants need repotting less often
  • Non-breakable fabric lasts doesn't crack from frost or if dropped
-$6.30 SALE OFFBestseller No. 3
Smart Pots 20-Gallon Smart Pot Soft-Sided Container, Tan with Strap handles
  • Soft-sided fabric aeration container that has the rigidity to hold its shape
  • Provides aeration, enhancing root structure, resulting in a vigorous plant with more flowers and fruits and increased insect and disease resistance
  • Allows excess heat to escape
  • Developed for, and used by commercial tree growers
  • 20 Gallon capacity; 20 inch diameter x 15.5 inch height
-$3.00 SALE OFFBestseller No. 4
T4U Fabric Plant Grow Bags with Handle 10 Gallon Pack of 5, Heavy Duty Nonwoven Smart Garden Pot Thickened Aeration Nursery Container Black for Outdoor Flower and Vegetables
  • 【Breathable Fabric】 - Made of thickened and breathable non-woven fabric, environment friendly and BPA-free. Keep plants warmer in winter and cooler in summer, ideal for plant growing.
  • 【Reinforced Handles】 - The sturdy handles with X shape sewing on both sides of the bag make lifting and moving more convenient and easier without any worry of handle ripped off.
  • 【Heavy Duty Plant Bag】- Durable smart fabric pot with thickened bottom ensures more weights bearing, supporting full bag of soil and plants. Perfect for growing potato, tomato, chilli and most greens.
  • 【Prevent Root Circling】 - Excellent air permeability and drainage help prevent root circling and rotting, naturally air pruning "burns" off the exposed roots to promote plant's healthy growth.
  • 【Use it for Years】 - Breathable and thick material with automatic air-prune feature effectively reduce punctures on container's surface, keeping the grow bag in a good using condition for years.
-$3.16 SALE OFFBestseller No. 5
Smart Pots 5-Gallon Smart Pot Soft-Sided Container, Black with Cut handles
329 Reviews on Amazon
Smart Pots 5-Gallon Smart Pot Soft-Sided Container, Black with Cut handles
  • Soft-sided fabric aeration container that has the rigidity to hold its shape
  • Provides aeration, enhancing root structure, resulting in a vigorous plant with more flowers and fruits and increased insect and disease resistance
  • Allows excess heat to escape
  • Developed for, and used by commercial tree growers
  • 5 Gallon capacity; 12 inch diameter x 9.5 inch height

2. Underwatering

Underwatering

Underwatering seeds is another common problem that affects the growth of cannabis plants. Even though the problem is not as common as overwatering, underwatering also display easily visible symptoms. The symptoms include dry soil with no moisture, plant wilting, and drooping, stunted growth, twisted and discolored plants.

Underwatering happens especially with beginners that overcompensate after learning of the dangers of overwatering. Combining nutrient overdose with underwatering also causes the seedlings to turn into a dark green color, alongside all the other symptoms.

Water is an essential ingredient for plant growth, and since they lose much of it through transpiration, you need to ensure that the soil has enough moisture throughout for proper growth processes and functions.

If you allow the roots to dry out, they will eventually die, and you will have no plants to look forward to growing to maturity. Underwatering is an easy thing to fix. All you need to do is water the plants once you see the growing medium drying up or the plants wilting due to lack of water and moisture.

Water the plants regularly, even though the soil mix is hot or has many nutrients. Once the plants start adapting to frequent and enough water supply, they will come back to life fast.

3 .Nutrient Toxicity

The symptoms of too many nutrients in your seedlings include leaves that are spotted, crispy, discolored, or yellow. Other nutrient toxicity symptoms include dark leaves and tip burns. Nutrient issues come from overfeeding the seedlings with too many nutrients or too little of them.

You can also have a nutrient issue if you use the wrong nutrients.  Seedlings should use correct and enough nutrients that help them to stay green at all times. One of the main nutrient toxicities is nitrogen deficiency. Plants with nitrogen deficiency turn leaves into brown and yellow colors. The leaves also go soft before folding and falling off the plant.

Nutrient Toxicity
Dark leaves often indicate a nitrogen toxicity (too much nitrogen)

Nutrient Toxicity-2

Nutrient deficiency affects older leaves at the bottom of the plant first before it starts to impact leaves on the other parts of the plant. Another major cause of nutrient toxicity is using slow-release soil. Slow-release soil causes nutrient burn to the seedling, affecting plant growth and the final yield. One example of slow-release soil is Miracle-Gro Soil.

Contrary to what some growers believe and practice, seedlings do not need many nutrients until they are three-week-old sprouts. Nutrient toxicity also develops fast, so you should be very careful about how much you feed the seedlings.

-$18.04 SALE OFFBestseller No. 1
FoxFarm FX14054 Happy Frog Nutrient Rich Rapid Growth All Purpose Perlite Peat Garden Soil Potting Mix, 12 Quart
  • Ready to use right out of the bag
  • This unique mix is alive with beneficial soil microbes and mycorrhizal fungi
  • Dramatically expands root development enabling plants to feed more aggressively
  • Not for sale in: FL,GA,HI,IN,MO,SD
Bestseller No. 2
FoxFarm Ocean Forest Potting Soil Mix Indoor Outdoor for Garden and Plants | Plant Fertilizer | 12 Quarts | The Hydroponic City Stake
8,013 Reviews on Amazon
FoxFarm Ocean Forest Potting Soil Mix Indoor Outdoor for Garden and Plants | Plant Fertilizer | 12 Quarts | The Hydroponic City Stake
  • Ultimate potting soil that has everything your plants need in one bag
  • Ocean Forest is pH adjusted at 6.3 to 6.8 to allow for optimum fertilizer uptake
  • Ocean Forest has a light, aerated texture that's perfect for indoor and outdoor plants
  • Designed for containers and ready to use right out of the bag
-$13.07 SALE OFFBestseller No. 3
FoxFarm Ocean Forest Potting Soil, 1.5 cu ft
  • Ocean Forest organic soil is ready to use right out of the bag
  • Ideal for containerized plantings
  • Contains earthworm castings, bat guano and micronutrients
  • Light texture and well aerated
  • Available in 1.5-Cubic feet
-$1.43 SALE OFFBestseller No. 4
Foxfarm FX14053 Ocean Forest Plant Garden PH Adjusted 12 Quarts Potting Soil Blend Mix for Containerized Plants, 11.9 Pound Bag (2 Pack)
  • QUALITY: FoxFarm Ocean Forest garden soil is the ultimate potting soil that has everything your plants need in one bag!
  • CONTENTS: 12 Quarts of a blend of earthworm castings, bat guano, sea-going fish & crab meal, forest humus, moss & more
  • PH LEVELS: Ocean Forest is pH adjusted at 6.3 to 6.8 to allow for optimum fertilizer uptake
  • BENEFITS: Encourages strong branching and a sturdy, healthy growth habit and is ideal for containerized plantings
  • SIZE: (2 Pack) Each bag weighs: 11.9 lbs. Package Dimensions (L X W X H): 18.0" x 11.0" x 15.0"
Bestseller No. 5
Fox Farm Ocean Forest and Happy Frog Potting Soil Organic Natural Soil Mix for Indoor and Outdoor Plants - Organic Plant Fertilizer - (12 Quart). - (Bundled with Pearsons Protective Gloves) (2 Pack)
615 Reviews on Amazon
Fox Farm Ocean Forest and Happy Frog Potting Soil Organic Natural Soil Mix for Indoor and Outdoor Plants - Organic Plant Fertilizer - (12 Quart). - (Bundled with Pearsons Protective Gloves) (2 Pack)
  • ✅Ocean Forest and Happy Frog Potting Soil is ready to use right out of the bag and provides the ideal environment for young seedlings to become thriving plants.
  • ✅Fox Farm Garden Soil is Lightweight and well-aerated, it is specially formulated to grow seedlings and cuttings and perfect all-natural mix for container grown plants!
  • ✅Ocean forest is soil ph. adjusted at 6.3 to 6.8 to allow for optimum fertilizer uptake making the naturally rich ingredients an ideal environment for seedlings toe strong, vigorous plants.
  • ✅Ocean Forest organic soil is perfect for indoor and outdoor plants growing. Ideal for containerized plantings. Contains many micro-nutrients .
  • ✅Bundled with Pearsons Protective Gloves. Protect your hands when you planting or manage your garden.

4. Lighting Issues

Too much or too little lighting is another issue that affects cannabis plants. Probably the most widely recognized lighting issue that include over the top or too minimal light, incorporates burnt out leaves, taller than normal seedlings that outgrow their size in search of light, badly crinkled leaves, and superfluous stem spaces between stem nodes. Plants get tall due to lack of enough light while they look burnt or fried when they have too little light.

light-burned-cannabis-leaves
This cannabis seedling is being burned by too-close LED grow lights
too-tall-seedlings-lack-of-light
The plant not getting enough light. It’s “reaching” upwards, trying to find the sun.

If you are growing your marijuana indoors, you can fix the lighting problem by moving the lights further or nearer your plants. If you are growing your weed outdoors, you can fix the problem by covering the plants when it gets extremely hot.

Also, ensure that all your plants, whether you are growing indoors or outdoors, get enough light exposure. During the seedling stage, cannabis plants need little lighting, but you should adjust as the plants grow.

Bestseller No. 1
KingLED 2023 Newest 2000w LED Grow Lights with Yield LEDs 3x3ft Coverage Full Spectrum Grow Lights for Indoor Hydroponic Plants Greenhouse Growing Lamps Veg Bloom Daul Mode
  • HIGH QUALITY LED GROW LIGHT: KingLED grow light has adopted the newest LEDs to provide high PAR output, high energy efficiency with 2.8 umol/J while improving light penetration. Perfect for 3x3ft vegetative coverage and 3x3ft flowering coverage
  • FULL SPECTRUM LED GROW LIGHT: The proportion of the spectrum has been adjusted in order to provide more matching spectrum for MJ, provides full spectrum lighting of natural light for plants, veg and bloom modes are designed to provide proper light for plants in different growth stages from seedling to flowering to greatly increase your harvest.
  • COST-EFFECTIVE LED GROW LIGHT: Different from the traditional grow lights, Our 2000W LED light adopts a high-tech SMD LEDs and reflector technology , compares to traditional 1000W HPS/MH while consuming only 200W! It provides brighter light and save more electricity which also can save a lot of money for you
  • DURABLE LED GROW LIGHT:Multiple high-speed mute fans and upgraded aluminum radiators enable the light bulb to work at 50°F to 60°F that is lower than other lamps. In a lower temperatures, your plant won’t be burned which could increase your lighting time and promote plant growth, Super long use time, so that you do not have to change the light frequently
  • PROFESSIONAL SERVICE: 3 years Professional Service and free return for 90 days. KingLED Laboratory has more than seven years of sales with after-sale service team professional in design, sales and production for the best products and service for the majority of customers. If you have any questions, please contact us freely, and we will reply within 24 hours to provide you a satisfactory result
-$10.00 SALE OFFBestseller No. 2
Spider Farmer 2023 Newest SF1000D LED Grow Light with Samsung LM301B Diodes Deeper Penetration & IR Lights Full Spectrum Growing Lamps for Indoor Plants Seedlings Vegetables Flowers 3x3/2x2 Grow Tent
  • UPDATE DIODE and BETTER LIGHT PENETRATION: SF1000D changed from SAMSUNG 301D Diodes to More Expensive 301B Diodes-the highest light output LED available at present, delivers powerful light output and uniform canopy penetration to resulting maximum higher yields compared with other LED grow lights.
  • SUNLIGHT SPECTRUM: Blue, Full spectrum 660-665nm,3000K,5000K and IR, ideal for all growth stages (germination, clones or cuttings, mothers, vegetative, and flowering applications), help you solve of home’s natural light wasn't going to be adequate, turn your seeds into your own supply, produce beautiful high yielding plants.
  • LOWER RUNNING COSTS: SF1000D grow lights with high Energy Efficiency, Better Light Penetration. Consuming only 100W, achieve better or comparable results than 200 watts HID with 50% less heat and power consumption. Get 40% higher yields with less energy compared with other brand diodes. Veg footprint is 3 x 3 ft, Flowering footprint is 2 x 2 ft.
  • SAFER & MORE RELIABILITY: No Fan ZERO Noise, large areas of solid aluminum heat sink, special protective covers for cables, waterproof LED board, 50% longer lifespan compare with other brand lights. Allowing you to grow with confidence.
  • VALUE FOR THE MONEY: SPIDER FARMER LED Plant Lights are often copied but will never have our quality or commitment, we provide 5 years of after-service at a local maintenance center(US/CA/UK/EU/AU). Make sure you purchase authentic Spider Farmer grow lights, really can give you high-quality grow lights – at a price that is affordable. For any questions, feel free to e-mail us, and we will help you resolve them. Quality backed by our ironclad!!!
Bestseller No. 3
2000W LED Grow Light, Full Spectrum Plant Light with Daisy Chain, Grow Lights for Indoor Plants Greenhouse Hydroponic Growing Lamps with Veg Bloom Switch Coverage 5x5ft
  • LOW-PRICED & UPGRADE LED CHIPS: The new 2000W LED GROW LIGHT provides much brighter and improved efficiency. In fact, It is more efficient than the outdated 2000 watt grow lamps. As well, it offers the highest PAR/Lumen output per watt.
  • TOP FULL SPECTRUM GROW LIGHTS: The proportion of the spectrum has been adjusted in order to provide more matching spectrum for plant growth.The light include red,blue,white,IR which can replace natural sunlight,IR chips can promote plant growth and defend insects and disease,ideal for all kinds of indoor plants veg and flower at all growth stages.
  • VEG & BLOOM SWITCHES: Different bands of LEDs make up our true full spectrum light, which helps plants, vegetables and flower indoor growing at all stages.VEG for growing, BLOOM for seedling / flowering.
  • OUTSTANDING COVERAGE: LUYIMIN grow light has adopted the newest LEDs and 10 times Optical Condenser to provide high PAR output, high energy efficiency with 2.8 umol/J while improving light penetration
  • 5 YEARS WARRANTY: Plus 90 days satisfaction or return guarantee. We are so confident in our products' quality control, if any question pls contact us, we will offer you professional guidance to help your plants grow better,Lifespan: 100,000 hours.
Bestseller No. 4
LUYIMIN Upgraded 1000W LED Grow Lights with Dual Switch, Double Chips Full Spectrum Plant Light, Grow Lights for Indoor Hydroponic Plants Veg Flower Growing Lamps
122 Reviews on Amazon
LUYIMIN Upgraded 1000W LED Grow Lights with Dual Switch, Double Chips Full Spectrum Plant Light, Grow Lights for Indoor Hydroponic Plants Veg Flower Growing Lamps
  • NEW UPGRADES: Compare with the traditional 1000 watt grow lamps, this new Dual-Chips 10w led lights is bigger, brighter and efficient.
  • FULL SPECTRUM LIGHT For INDOOR PLANTS: Our LED grow lights provides full spectrum lighting from 380 nm to 780 nm (including UV + IR) of natural light for plants needed of all growing stages from vegetables to flowers. Achieve greater yield while saving you on energy costs!
  • VEG/BLOOM DOUBLE SWITCH -- This special switch design was made to provide proper light for plants in different growth stages , and gives your plants more better living environment.Perfectly help you to care plants and save you more time.
  • DURABLE LED GROW LIGHT:Multiple high-speed mute fans and upgraded aluminum radiators enable the light bulb to work at 50°F to 60°F that is lower than other lamps. In a lower temperatures, your plant won’t be burned which could increase your lighting time and promote plant growth, Super long use time, so that you do not have to change the light frequently.
  • WORRY-FREE WARRANTY: Plug and Play. No installation required. Product quality and friendly customer service are always our top priority. We offer worry-free 36-month warranty and professional guidance to help you and your plants grow better.
Bestseller No. 5
LORDEM Plant Grow Light, Full Spectrum Plant Light for Indoor Plants, Brightness Adjustable LED Growing Lamp with Auto On/Off Timer 4H/8H/12H, Height Adjustable, 2 Packs of Black
871 Reviews on Amazon
LORDEM Plant Grow Light, Full Spectrum Plant Light for Indoor Plants, Brightness Adjustable LED Growing Lamp with Auto On/Off Timer 4H/8H/12H, Height Adjustable, 2 Packs of Black
  • 144 LEDs Full Spectrum Grow Light: The set of 2 black grow Lamp uses high-efficiency diodes with 72 LEDs and higher lumens output. It emits all the wavelengths from 380nm to 800nm, 5000K (34pcs White), 2800K-3000K(24pcs Warm White), 660-665nm(10pcs red light), 4800K-5000K(4pcs Blue), ideal for all growth stages and various plants such as succulent, orchids, herbs, monstera, tomatoes, etc. HELP YOUR PLANTS GROW BETTER!
  • Brighter Grow Light with 4 Brightness Settings: Our newest upgraded growing light, the diode arrangement gathered into a circle, makes the PPFD more uniform, allowing plants to absorb light better, and grow happier. Also, it has 4 dimmable brightness settings(25%-50%-75%-100%) to meet different kinds of plants with different requirements for light intensity.
  • Auto on/off Timer Every Day: The plant lamp is designed with 3 circular timing settings for 4H/8H/12H, it will automatically turn on/off every day according to your settings. Even if you are on business or vacation, the plant light will still take good care of your plants daily. A GOOD PARTNER FOR PLANTS! (50,000 hours lifetime.)
  • Height Adjustable & Easy to Use: Fix the telescopic rod with the grow light panel, insert it into the soil, plug-in power, and turn it on. You are done, so easy to use! The adjustable height range is 11"- 56", you can pull the telescopic rod up and down to adjust the desired height for your plants to satisfy the PPFD needs of different plants. A larger area or more plants will be covered when the telescopic rod is extended longer.
  • 13ft Long Cord: The cord is super long, you can use the grow light for your hanging plants or the plants away from the power. MORE FLEXIBLE TO USE! We provide 12 months warranty and 30 days money-back guarantee. If you have any questions about the products, please feel free to contact us!

5. High Temperatures

Another common cannabis seedling problem is high temperature. High temperature leads to leaves looking like canoes and tacos displayed by curling edges. Besides curling, the leaves also show spots and wilt. The best temperature levels to maintain in your grow room if you want your plants to grow healthy is between 68 and 78 degrees Fahrenheit.

heat-too-high-cannabis.jpg
Heat gets too high
heat-seedling-curling-down.jpg
Leaves sort of fold downwards due to heat, too, like this seedling

To ensure that the temperature stays at the required levels, you should monitor it closely and use a thermometer to help you keep it in check. Another way of maintaining desirable temperature levels in the grow room is by ensuring that the grow lights are not too close to the plants. Maintain the required light distance to avoid overheating and burning plant canopies.

Read next: Best Temperature and Humidity Controllers

Desirable Traits of Cannabis Seedlings

If you want healthy looking cannabis seeds, you should look out for the following traits.

Healthy seedlings, leaves, and stalks should bear a green color. If you notice that the seedlings have a purple color while the stems and stalks are a grayish color, it is an indication that the development of the roots is poor. The color changes are also an indication that the roots cannot process nutrients adequately.

healthy-cannabis-seeding
Healthy Cannabis Seedlings

You can tell the cannabis plant is healthy if the leaves are upright and parallel to the soil. Improperly formed leaves will show a trait such as discoloration, droop down, and curls. The defects are an indication that the seedling is not handling the same conditions other seedlings are thriving in well enough.

Unless you are growing your cannabis seedlings in aeroponics or deep-water culture (DWC), it is not always possible to monitor your plant’s root development easily throughout their growing cycle. However, you can tell if they are healthy if they display the appropriate height depending on their age, and the leaves have the appropriate size and set well without curling.

Visibility of the positive traits expected of the cannabis plants such as density, good health, and branching, is mostly possible during transplantation and the harvesting period.

If you notice seedlings that do not keep up with the rest in terms of healthy leaf development, height gain, robustness, and growth rate, you should dispose of them because they are defective. In some cases, you may decide to throw caution to the wind and keep the undesirable or defective seedlings in the hope that they might stay alive and germinate into healthy plants.

It is a tough decision to make, but it is not unusual for defective seedlings to turn around and surprise you with the deliverance of healthy plants and highly potent yields. However, you also have to prepare yourself if you decide to take that road because many of the defective seedlings may grow into plants. However, you have to contend with ending up with unhealthy plants prone to several diseases, provide little yields, and need lots of attention throughout their growing cycle.

Wrapping It Up

Growing cannabis is not a walk in the park, especially for those doing it for the first time. However, enough knowledge about what to expect during the growing cycle and enough practice makes cannabis growing both fun and fulfilling. Using seedlings to start your growing journey needs, the utmost care because they are delicate and susceptible to many ills.

Before putting them in the ground, the first step is to ensure that your seedlings are from a reliable and trusted seller. Buying from a reputable seller assures you of strong, resilient, and easily adaptable seeds that will grow to healthy plants and high yields. The next step is caring for the seedlings.

Do not feed them with too much water or give them too little that will end up killing them. Ensure that the lighting system you have in your grow space provides full-spectrum light to cover all the seedlings.

Monitor the temperatures carefully to prevent the crops from burning out and get a dehumidifier if the place is too humid. If you have seedlings that do not measure up, get rid of them, and leave only the strongest for better yields and fewer problems. The whole exercise may seem too challenging, but it is worth the effort.

Bestseller No. 1
Elitech Temperature and Humidity Controller STC-1000WiFi Pro TH T&H Cooling Heating Switch On-Off Thermostat for Heat Pad Reptile Aquarium Homebrew Freezer -40~230°F Pre-Wired Outlets 110V 1100W 10A
263 Reviews on Amazon
Elitech Temperature and Humidity Controller STC-1000WiFi Pro TH T&H Cooling Heating Switch On-Off Thermostat for Heat Pad Reptile Aquarium Homebrew Freezer -40~230°F Pre-Wired Outlets 110V 1100W 10A
  • [WIFI REMOTE MONITORING] Control the temperature through our Elitech icold platform or APP, detect data at any time, the chart shows the data more clearly, and the APP is free to use.
  • [DUAL REPLAY OUTPT] Two devices can be connected at the same time, WORK1 for temperature control and WORK2 for humidity control.
  • [WIDE TEMPERATURE CONTROL RANGE] Temperature and humidity two-in-one sensor, the temperature control range is 23°F~158°F, and the humidity control range is 5%RH~99%RH. Cool or heat, humidify or dehumidify according to the configured parameters, helping to maintain the desired temperature/humidity at all times.
  • [TEMPERATURE ALARM] Set the temperature according to your needs. When the temperature is higher or lower than the set temperature, the buzzer will give an alarm. It also supports email and SMS alarms.
  • [MULTI-FUNCTION] With power-off memory, start-up delay, temperature or humidity calibration, temperature unit ℃/℉ and humidity continuous working time.
Bestseller No. 2
Xetron Temperature and Humidity Controller 110V 10A Digital Humidistat Thermostat Controller Pre-Wired Outlet for Fan Seed Fermentation Reptiles Heater, STC-1000ProTH NotWIFI
155 Reviews on Amazon
Xetron Temperature and Humidity Controller 110V 10A Digital Humidistat Thermostat Controller Pre-Wired Outlet for Fan Seed Fermentation Reptiles Heater, STC-1000ProTH NotWIFI
  • 【Ideal Temperature & Humidity Control】 Temperature (Work1 for Heating or Cooling) and Humidity (Work2 for Humidify or Dehumidify) modes can be used simultaneously or independently all the time. Wide temperature control range: 23 ℉~158 ℉/-5~70℃ with accuracy ±1℉/±0.5℃. Humidity range 5%RH~99%RH and accuracy ±5%RH. NOTE: Not WIFI version No APP
  • 【Perfect fit for your DIY project】 Save power and your money! Personalized parameters can be set, support settings including ℃/℉, temperature & humidity calibration, high and low alarms value, start-up delay, protection time and etc., to meet the different needs of users.
  • 【Dual Alarm】 The Buzzer Beeps and bell icon display if the temperature or humidity goes out of settable alarm limits. Ideal for fan freezer refrigerator homebrewing reptiles pets house fermentation incubation greenhouse terrarium etc.
  • 【Easy to Operate】 No other accessories required and use it directly. 2 Pre-wired temperature and humidity outlets and simple 3-button design makes the temperature humidity controller plug and play, with the 2.5" large LCD screen display.
  • 【Security & Quality】 Made of anti-flame ABS material, comply with CE, FCC standard and it has compressor delay protection, making it more secure to use. If you have any questions please contact us, our product has a one-year warranty and lifetime customer service.
Bestseller No. 3
Inkbird WiFi ITC-308 Digital Temperature Controller Thermostat Remote Monitoring Controlling Home Brewing Fermentation Breeding Incubation Greenhouse
3,332 Reviews on Amazon
Inkbird WiFi ITC-308 Digital Temperature Controller Thermostat Remote Monitoring Controlling Home Brewing Fermentation Breeding Incubation Greenhouse
  • 👍👍【Android & IOS WIFI App】WIFI APP - WIFI smart controller supports both IOS & Android. WIFI connection supports 2.4GHz Wi-Fi band with free “INKBIRD” APP to control the temperature remotely.
  • 👍👍【Dual Relay Output】Dual relay - able to power refrigeration and heating equipment as conditions change.
  • 👍👍【High/Low Temperature Alarm】 Set High/Low temperature alarm when the temperature is over or under preset temperature or the sensor experiences a malfunction.
  • 👍👍【Convenient Design】Plug-n-play, easy to use. Supports ℃/℉reading and Temperature calibration.
  • 👍👍【1100W Max Output】Maximum output load: 1100W(110V).【Safety】Maximum output load: 1100W(110V). Customize temperature and compressor delay, protecting your refrigeration/heating equipment.
Bestseller No. 4
DIGITEN DHTC1011 Humidity and Temperature Controller Plug-in Thermostat Humidistat Outlet Humidity Controller Greenhouse Thermostat Cooling Heating Humidifier Dehumidifier
  • 🌻【Wide Control Range】Temperature and humidity 2 in 1 sensor; temperature control range is -40℉~248℉, humidity control range is 1%RH~100%RH. It starts cooling or heating, humidifying or dehumidifying according to configured parameters, which helps to keep a desired temperature and humidity anytime.
  • 🍻【Multi-functional Setting】Supporting calibration, compressor delay and saving reset setting values. Centigrade or Fahrenheit degree display, easy to set. High or low temperature and humdity alarms are available. And with temperature calibration and compressor delay for protecting cooling device. It can save the original setting values in case accidentally power-off.
  • 🌱【Convenient Design】The temperature and humidity controller has a large LCD screen with simple 3-button, and pre-wired design making it easier for use with plug and play.
  • 🐢【Dual Relay Output】Be able to control temperature and humidity equipments at the same time, one is for temperature controlling and another is for humidity controlling.
  • 🍄【Multiple Use】Widely used for home brewing (refrigerator), fermentation, greenhouse, terrarium, reptile, planting (mushroom), meat storage and cooking, ventilator fan, crawl space, turtle enclosure, curing chamber, snake cage, tobacco cage, etc.
Bestseller No. 5
VIGELA STC-3028 AC110~230V All-Purpose Temperature and Humidity Controller with Dual Displays and Dual Relay Outputs(Shipping with 2 Sensors)
31 Reviews on Amazon
VIGELA STC-3028 AC110~230V All-Purpose Temperature and Humidity Controller with Dual Displays and Dual Relay Outputs(Shipping with 2 Sensors)
  • Embedded, without socket.Shipping with 2 high-performance integrated sensors(black or grey,one more sensor is delivered as a backup), 1.5m(59in)extension cable, ABS flame retardant plastic shell.
  • Input power supply voltage: AC110~230V (± 10%),and Relay Output:maximum loaded current 11A.Can realize temperature control and humidity control at the same time.Can realize temperature and humidity correction.
  • Temperature and humidity dual display intelligent version: temperature range: - 40 ℃ ~ + 110 ℃, humidity range: 00% RH ~ + 100% RH, accuracy: ± 0.3℃ & 3% RH.
  • Widely used: various sensor control boxes, water heaters, refrigerators, fans, etc. can be used in scientific research, planting, aquaculture and other fields.
  • This is an excellent and convenient multifunctional device, which is used for temperature and humidity control of air environment to help you create the best temperature and humidity environment. Please do not soak in water. Please refer to the manual when using.
5/5 - (3 votes)

Bowden draws from over a decade of home growing experience as well as consulting for small-scale and hobbyist-level growers. He has written hundreds of articles, thought pieces, and tutorials about growing cannabis at home

Leave a Comment