The Common Causes of the Yellowing of Marijuana Leaves

Sometimes things can go wrong in your cannabis garden even when you are taking great care of your plants. Even the most experienced cannabis growers can occasionally experience problems and yellow leaves are usually the first sign of trouble. Chlorosis or the yellowing leaves can be caused by incalculable reasons, and this is why growers need to know their causes and potential remedies.

cannabis leaves turning yellow

This article delves into the details of yellow leaves in cannabis plants to help you identify the common causes. We have also incorporated some helpful tips for curing affected plants.

Cannabis home growers can use these tips to prevent the leaves of their cannabis plants from turning yellow. Read on to know more about cannabis leaves turning yellow.

792x276 endofseason

BUY MARIJUANA SEED HERE

Proper Diagnosis of Yellow Leaves on Marijuana Plants

The yellowing of leaves on cannabis plants can be caused by many factors. Growers need to narrow down any possible causes by analyzing the affected plants. You need to first take note of the location of yellow leaves on your cannabis plants. Determine whether the yellow leaves are situated at the bottom of the plant or whether it is only the new leaves that are affected. Here is how you can properly diagnose yellow leaves on cannabis plants.

Lower Leaves Turning Yellow

When the lower fan leaves on your plants turn yellow, it can be a sign that your plants are not getting adequate nitrogen. When the cannabis plants have a deficiency, the nitrogen in lower leaves will mobilize to enable new growth. This kind of chlorosis usually starts at the leaf tips and will slowly migrate to the stem.

Marijuana plant roots only absorb nitrogen when conditions are right. Therefore, soil that is extremely wet or dry and incorrect pH can slow down or stop the plants from mobilizing nutrients. If you notice only a few yellow leaves close to the base of the plant, the chlorosis can be a natural process of the plants shedding unwanted leaves.

Chlorosis of New Growth Leaves

Chlorosis of New Growth Leaves

When the uppermost leaves start yellowing, you need to first check for signs of light burn. The tips of new leaves will turn yellow when they are receiving excessive heat from grow lights. You should place your hand on the upper most leaves and if they get hot or warm, then it means the lights are very close.

If the yellowing is not caused by light burn, then it can be because of nutrients deficiency such as iron. Iron is considered an immobile nutrient, unlike nitrogen. Once iron has been absorbed by cannabis plants, it usually stays where it is. As a result, new growth leaves will not get iron and they will eventually turn yellow. When the yellowing is at the beginning of flowers, then it can be because of magnesium or calcium deficiency and the yellow can quickly clear up when you supplement calcium or magnesium.

Yellowing of Cannabis Seedling Leaves

If the leaves on your cannabis sprout or seedlings are yellowing, then this is not a nutritional problem. Seeds are packed with nutrients and energy and will grow healthy for a few weeks. Your seedlings may be turning yellow because of a lack of adequate light or bad watering habits.

Yellowing of Cannabis Seedling Leaves

When cannabis sprouts are overwatered, the roots will start drowning. As a result, adequate oxygen will not be absorbed and growth will not be facilitated resulting in the yellowing of leaves. The roots can also dry out because of lack of enough water and the seedlings will turn yellow and wilt. If your sprout grows skinny and tall, but leaves turn yellow, then it is a sign of lack of enough light and upgrading your lighting is necessary.

Common Causes of Cannabis Leaves Turning Yellow

Chlorosis is simply a technical term for the yellowing of leaves and mainly occurs due to a lack of chlorophyll in the leaves. Many factors can cause the yellowing of leaves in cannabis plants. Sometimes yellowing of leaves is natural, while other times it is your plant trying to show you it is having problems.

When marijuana leaves turn yellow, it does not mean they will die as there are remedies that can be used to completely stop this phenomenon. As a result, your marijuana plants will continue growing healthier and stronger.  The yellowing of marijuana leaves can be caused by any of the following:

Overwatering

Overwatering yellowing cannabis

Overwatering is a common problem, particularly for novice marijuana cultivators. In a bid to meet all the needs of the plant some growers may end up overdoing things. As a result, growers may end up drowning their cannabis plants unknowingly. Overwatering tends to saturate the soil causing a reduction of oxygen levels, which eventually starves the roots.

Marijuana plants utilize roots for the uptake of nutrients from the soil. When the roots start dying off, the plants will have access to fewer nutrients resulting in deficiencies. The yellowing of leaves is common when cannabis plants are not getting the nutrients and mineral elements that they require to thrive.

Fixing Overwatering:

Solving overwatering is simple. You can avoid over watering by ensuring that you plants only get enough water every day. Cannabis requires less water to grow than most growers think. Before you water your marijuana plants, it is advisable that you give the topsoil time to dry. You can verify this by using your fingers or pushing a skewer into the growing soil.

Underwatering

underwatering-causes-yellow-cannabis-leaves

Underwater is also another cause of marijuana leaves yellowing. If your plants do not get enough water, they will develop yellow leaves. During transpiration, water potential is used in pulling up water into the leaves and stem.  Water is also crucial during photosynthesis as it helps in the production of energy. This is the reason why leaves start wilting and turning yellow when water is missing.

When marijuana leaves do not get enough water, the tip of the leaves will curl downward developing a claw shape. Over time, the leaves will keel over and die if the marijuana growers do not intervene.

Fixing Chronic Underwatering Problem:

For chronic underwatering of cannabis plants, you just need to water your plants. Be sure to follow the recommended guidelines for watering your plants by allowing the top inch of the soil to completely dry out. Remember that diagnosing chronic underwatering is a challenge because this problem may just look like most nutrient deficiencies. However, your main clue will be your cannabis plants perking up whenever you water them.

Be sure to monitor the post-feeding behavior of your cannabis plants. You can prevent recurrence by using a humidity meter to accurately gauge when you should water your plants. Excessive water can cause root rot, while very little water can result in stunt growth.

pH Imbalance

Yellowing of Cannabis pH Imbalance

Another common cause of yellowing of cannabis leaves is pH that is too low or too high. pH is simply the measurement of alkalinity or acidity of a liquid and it is determined by the level of hydrogen ions in the water. When the pH levels are off, cannabis plants tend to have challenges absorbing nutrients from the soil even when they are present close to the roots.

In general, the pH for water is 7.0 and this pH changes when you add nutrients to it. This is why you must be cautious of the pH of water that you are feeding your cannabis plants with. Growers can get the best yield and results from marijuana grown in soil that maintains a pH of about 5.8 to 6.0.

Fixing pH Imbalance:

Cannabis growers need to use a pH level measuring kit or pen to monitor the acidity levels of what they are feeding their cannabis plants. If the levels are not close to the optimum range, you can add an acid or base to lower or raise the pH levels.

Bestseller No. 1
Alkaline Water (ph Test Kit) for Drinking Water Measures pH Level of Water More Accurately Than Test Strips pH Starter Kit Drops Easy to Use
1,288 Reviews on Amazon
Alkaline Water (ph Test Kit) for Drinking Water Measures pH Level of Water More Accurately Than Test Strips pH Starter Kit Drops Easy to Use
  • Test any clear liquid in a pH range of 4.0-10.0
  • Easy to use squeeze bottle
  • All parts and ingredients made in USA
  • Instructions included
Bestseller No. 2
Ph Test Liquid Kit for Drinking Water Measures pH Level of Water More Accurately Than Test Strips pH Starter Kit Drops Easy to Use
454 Reviews on Amazon
Ph Test Liquid Kit for Drinking Water Measures pH Level of Water More Accurately Than Test Strips pH Starter Kit Drops Easy to Use
  • Wide pH range from 4.0~10.0 for most clear liquid
  • Easy to use squeeze bottle
  • Easily portable and simple to use
  • Instructions for use are included
Bestseller No. 3
Invigorated Water pH Tester - Measures pH Levels of Water and Saliva - More Accurate Than pH Test Strips - pH Water Tester - pH Level Tester for Water - pH Tester Water Drops - pH Test Kit (3-Pack)
1,464 Reviews on Amazon
Invigorated Water pH Tester - Measures pH Levels of Water and Saliva - More Accurate Than pH Test Strips - pH Water Tester - pH Level Tester for Water - pH Tester Water Drops - pH Test Kit (3-Pack)
  • Quickly Understand the pH Scale of Water – pH PERFECT pH test kit will help you quickly determine the pH balance of water. Simply squeeze a few drops of pH PERFECT reagent liquid into a small sample of water and wait for the water to change color. Compare the water color with the included pH scale chart, to confirm pH levels.
  • More Accurate for Testing Water pH Than pH Test Strips – pH test strips are designed for testing the pH levels of saliva and urine to determine where it sits on the pH scale, not for testing the pH balance of water. pH PERFECT is the ideal & accurate pH tester for water.
  • Super-Sized Value 3-Pack – pH PERFECT includes three 0.33 ounce (10ml) bottles. Every time you test the pH levels of your water, or saliva, you’ll only need a few drops of pH PERFECT, making this value 3-pack super-long lasting.
Bestseller No. 4
Fosmon Soil pH Tester - 3 in 1 Measure Soil pH Level, Moisture Content, Light Amount Soil Test Kit for Indoor Outdoor Plants, Flowers, Vegetable Gardens and Lawns
813 Reviews on Amazon
Fosmon Soil pH Tester - 3 in 1 Measure Soil pH Level, Moisture Content, Light Amount Soil Test Kit for Indoor Outdoor Plants, Flowers, Vegetable Gardens and Lawns
  • [MOISTURE, PH, SUNLIGHT IN ONE] Test soil moisture, pH value and sunlight by one single meter. Quickly helps you to know when you need to water your plants. Control the pH value in the soil and know whether the plants are getting adequate sunlight.
  • [FASTER & MORE ACCURATE READING] The premium double-needle design supports the accurate and reliable measurement of soil moisture and pH acidity.
  • [EASY TO USE] No batteries needed. Easily switch back and forth between moisture, pH, and sunlight position. Insert the sensor probes into the soil about 2-4 inches, adjust position of probe until pointer swings, and read the value. Clean the probe after each use.
  • [WIDE MEASUREMENT RANGE] Moisture Range: 1-10 (1-3 Dry , 4-7 Normal, 8-10 Wet), Relative Light: 0-2000lux (0-200 Low, 200-500 Low+, 500-1000 Normal, 1000-2000 High), pH Range: 3.5-8ph (3.5-6.5 Acid, 7-8 Alkaline)
  • [INDOOR & OUTDOOR USE] Design to be light and portable and easy to carry around for outdoor use. Ideal soil test meter for home, garden, lawn and farm, both soil-less mixtures and soil grown plants.
Bestseller No. 5
Liquid pH Test Kit by Santevia | Use pH Drops to Accurately Measure The pH of Your Water | Quickly & Easily Monitor pH Levels
79 Reviews on Amazon
Liquid pH Test Kit by Santevia | Use pH Drops to Accurately Measure The pH of Your Water | Quickly & Easily Monitor pH Levels
  • Kit includes 1 water pH testing solution and 1 clear vial
  • pH scale included on the side of the packaging
  • Life Expectancy: 1 year if unopened, 6 months if opened
  • Approximately 60 tests possible per pack
  • Comes with easy-to-follow instructions

Light Burn

Yellowing of Cannabis Light Burn

If the top of your cannabis plants are turning crispy, yellow, and curling up or down, then one cause can be light burn. In most cases, leaves closer to the lighting sources usually show severe symptoms. This is because excessive heat tends to fry the cannabis leaves causing massive damage to them. High-intensity and powerful lights like LEDs tend to cause light burn because they produce the least amount of heat.

How to Fix:

If your hand feels uncomfortably hot where the light hits the cannabis leaves, then it means the leaves also feel the burn. The best way to fix light burn is by moving the grow lights further away by a few inches. The optimal range between the plants and grow lights is usually 1 to 2 feet.

You can also bend over all affected cannabis plants to ensure they are further away from the light source. Ensure that the temperature at the uppermost leaves of the cannabis plants does not exceed 30 degrees Celsius or 86°F.

Read next: How Many Watts Per Square Foot for Led Grow Lights

-$61.99 SALE OFFBestseller No. 1
HYPERLITE Groplanner LED Grow Light GP1500m Manual Dimmable, 756pcs LEDs 3x3ft Growing lamp,Full Spectrum 150w Growing Lamps Board Daisy Chain for Indoor Plants Seeding Veg,Greenhouses Grow Tent.
176 Reviews on Amazon
HYPERLITE Groplanner LED Grow Light GP1500m Manual Dimmable, 756pcs LEDs 3x3ft Growing lamp,Full Spectrum 150w Growing Lamps Board Daisy Chain for Indoor Plants Seeding Veg,Greenhouses Grow Tent.
  • Manual Dimmable: Easy-to-use dimmer control. Using the dimmer knob, you can easily control the brightness of the grow light from 20% to 100% to suit different growth periods.
  • sunlike full spectrum:led grow Light is suitable for indoor cultivation of all plant growth stages: infrared 760nm/660nm red light/white light 3000knm/blue light 5000knm,the GP-6000 needed to supplement light for all types of plants in the event of insufficient light for indoor cultivation.
  • 756 pcs led: groplanner 150w grow light has 756pcs leads with a life span of 60000h and an energy efficiency of 2.75μmol/j.which is 50% less than other smd leds or violet lights or 50% less power consumption for hps.
  • quick lock and daisy chain:GP1500 has its own patented quick lock and daisy chain.,Assemble your own exclusive plant light according to the planting area at will.【Area: 3x3-150w grow light x1】【Area: 3x5-150w grow light x2】【Area: 6x6-150w grow light x4】in a home network environment, we recommend a maximum of 12~20 connections for control.
  • quality for the top: groplanner grow light 150W adopts a silent heat dissipation solution, 2mm thick heat sink + 4mm back pure aluminum back plate can dissipate the heat upwards quickly. to protect the led beads, the fully covered lens cover and sealing rubber ring give the GP1500 an ip65 waterproof rating, and the indoor grow light can be used normally in environments with a humidity of 10%~90%rh.
Bestseller No. 2
2023 Upgraded VIPARSPECTRA P2000 Led Grow Lights for Indoor Plants Full Spectrum, Dimming Daisy Chain Grow Lamp for Veg Bloom in 4x2/3x3 Grow Tents Greenhouses
1,431 Reviews on Amazon
2023 Upgraded VIPARSPECTRA P2000 Led Grow Lights for Indoor Plants Full Spectrum, Dimming Daisy Chain Grow Lamp for Veg Bloom in 4x2/3x3 Grow Tents Greenhouses
  • LOWER OPERATION COST & DIMMER FUNCTION: VIPARSPECTRA P2000 LED grow light has adopted the newst SMD Technology, new layout to provide high PAR output, high energy efficiency and long lifespan while improving light penetration. An added dimmer knob is featured to manipulate the brightness level of the entire light, allowing flexibility to obtain perfect growth performance for each growing phase.
  • FULL SPECTRUM LIGHT For INDOOR PLANTS: Consists of 660nm of red light, IR, 3000K and 5000K of the white light spectrum, provides plants in all stages from veg to flower with everything they need in the natural sunlight. Achieve greater yield while saving you on energy costs!
  • SLEEP-FRIENDLY GROW LIGHT: Silent fanless design. No fans zero noise. Built-in large areas of solid aluminum heat sinks, essential for heat dissipation while ensuring long lifespan of the light.
  • COVERAGE AREA: Comparable to traditional 400W HPS/MH while consuming only 200W! Perfect for 4’x3’ vegetative coverage at 24” and 4’x2’ flowering coverage at 20”. Remember to properly adjust the height and brightness accordingly to your plants desired level for optimal growth.
  • 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 local warranty and professional guidance to help you and your plants grow better.
-$6.05 SALE OFFBestseller No. 3
Grow Lights for Indoor Plants, GroDrow 150 LED Grow Light for Seed Starting with Red Blue Spectrum, 3/9/12H Timer, 10 Dimmable Levels & 3 Switch Modes, Adjustable Gooseneck Suitable for Various Plant
3,217 Reviews on Amazon
Grow Lights for Indoor Plants, GroDrow 150 LED Grow Light for Seed Starting with Red Blue Spectrum, 3/9/12H Timer, 10 Dimmable Levels & 3 Switch Modes, Adjustable Gooseneck Suitable for Various Plant
  • 【5 Heads Plant Grow Lights & 150 LEDs】This plant growing lamp consists of 150 efficient grow LEDs (100 red and 50 blue). 5 head plant grow light provide a wider lighting range than traditional 2, 3, and 4 head plant light and increase the intensity of light by up to 50%, allowing your plants to receive more energy.
  • 【3 Spectral Modes & 10 Brightness Levels】Full spectrum led grow light has 3 spectrum modes(Red, Blue & Mixed Spectrum). 10 brightness settings ranging from 10% to 100%, we can be switched at will, free to choose the most suitable brightness and spectrum for our plant growth. Makes plants grow 5 times faster than natural plants.
  • 【Auto Cycle On/Off & Timer Function】Designed with auto circular memory timing function and there are 3/9/12H timer setting options for your choosing. Plant grow light will turn on/off by itself every day as your setting. Even you're on the travel, these grow light strips will still take good care of your plants every day!
  • 【Strong Clip & Flexible Gooseneck】This 5 head grow lights have a strong clip and bracket support that can be stably placed and arbitrarily clamped anywhere. The indoor grow lights have a 360° independently adjustable gooseneck design, which can be rotated to any angle for your requirements, which provides a wider and more flexible range of light.
  • 【Designed for Plants Growth 】This indoor grow lights are perfect for seed starting can meet the different needs of plants for sunlight in different growth stages. The excellent heat dissipation performance ensures the lamps are more durable and the service life is up to 80,000 hours. Widely apply to greenhouses, herb garden, indoor garden, flower bed, succulent seeds, bonsai tree, especially plants, seeds & herb.
Bestseller No. 4
LEOTER Grow Light for Indoor Plants - Upgraded Version 80 LED Lamps with Full Spectrum & Red Blue Spectrum, 3/9/12H Timer, 10 Dimmable Level, Adjustable Gooseneck,3 Switch Modes
10,771 Reviews on Amazon
LEOTER Grow Light for Indoor Plants - Upgraded Version 80 LED Lamps with Full Spectrum & Red Blue Spectrum, 3/9/12H Timer, 10 Dimmable Level, Adjustable Gooseneck,3 Switch Modes
  • Efficient LED Combination: This LED lamp has grow lights made up of 80 efficient growing LEDs (36 red, 16 blue and 28 full spectrum). It meets the conditions of plant growth without sunlight. 1--Full Spectrum(380nm-800nm): Suitable for all plants to root and sprout. 2--Red(660nm)+BLUE(460nm) Spectrum: for blooming and fruits. 3--Red+Blue+Full Spectrum: A mix of Red+Blue+Warm White is best to fuel the growth of your plants.
  • Upgraded Auto ON/OFF Timer: Plant grow lights come with the circular memory timer function allows to automatically turn on/off every day according to your settings: 3H(Blue)/9H(Green)/12H(Red). Which requires no manual operation and takes good care of your plants when you on work or vacation.(Please note: The timer needs to be reset if the grow light is powered off.)
  • 10 DimmableModes: Our grow lamps provides 10 dimmable modes to suit varied stages of plant growth. It has 10 levels of light intensity and has 3 spectral modes to meet different stages of plant-growing needs.
  • Visible Quality and Adjustable: The LED grow lights have a USB connector which makes it convenient to connect in your office or home to USB or AC power plug (includes adapter). The 4-head light has a 360-degree flexible gooseneck made from quality tubing to keep a fixed position. The metal clamp allows the lamp to be placed anywhere in your home or office.
  • Scientific Heat Dissipation Design: Indoor LED grow light is backed by an aviation-grade heat sink powered by a temperature control unit. This improved heat sink efficiently dissipates the heat generated by the lamp to the atmosphere.
-$10.00 SALE OFFBestseller No. 5
Spider Farmer SF1000D LED Grow Light with Samsung LM301B Diodes & IR Lighting Full Spectrum Grow Light for Indoor Plants Veg Bloom Growing Lamps for 3x3/2x2 Grow Tent 2.5g/w
1,611 Reviews on Amazon
Spider Farmer SF1000D LED Grow Light with Samsung LM301B Diodes & IR Lighting Full Spectrum Grow Light for Indoor Plants Veg Bloom Growing Lamps for 3x3/2x2 Grow Tent 2.5g/w
  • 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 of local maintenance center(US/CA/UK/EU/AU). Make sure you purchase authentic Spider Farmer grow lights, really can give you a 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 it. Quality backed by our ironclad!!!

Heat Stress or Cold Shock (Temperature Problems)

Yellowing of Cannabis Heat Stress

Extreme temperatures can also cause the yellowing of cannabis leaves. Heat can affect the growth of pot plants and is usually caused by grow lights or poor circulation of air in the grow room. If you are cultivating your marijuana plants outside or in the basement, a cold spell during the night could also damage your plants.

When marijuana plants experience heat stress, the leaves usually turn yellow and they dry up. On the other hand, cold shocks cause the leaves to droop and eventually turn yellow. Either temperature extremes can kill your cannabis plants very fast.

Most indoor cannabis growers tend to struggle with heat rather than cold. When temperatures are below 10°C or 50°F, they can cause the leaves to become yellow and pale. Some marijuana plants can even die when the temperatures hit the freezing point.

How to Fix Temperature Problems:

You can use your hands to carry out the hand test where you hold the cannabis plants to ensure they are not extremely hot. If the surface feels too hot, then you should move the light up and away from the plants. You should also regulate the temperatures if they are above 85°F during the day or below 60°F at night.

You must also ensure that the grow space has good air circulation as it prevents hot spots. In addition, good air circulation will keep temperatures balanced through the whole room and aid the exchange of oxygen and CO2. If you are using grow containers, you must ensure they are placed on raised ground because putting them directly on the concrete floor can kill them overnight because of low temperatures. If your plants are outdoors, you can cover the plant roots at night to keep them warm.

Nutrient Deficiency

Nutrient-deficiency-marijuana-brown-tips.jpg

If your cannabis plants are watered correctly and the pH is okay, then the problem may be a lack of nutrients. For the yellowing of leaves, the culprits are usually nitrogen, phosphorus, iron, magnesium, zinc, sulfur, and potassium. Be sure to check the location of the yellowing on your cannabis plants and leaves. This will give you clues to help you know the nutrients that are lacking.

How to Fix Nutritional Deficiencies

Cannabis growers can stop the yellowing of leaves caused by a lack of nutrients by using fertilizers designed specifically for cannabis plants. You can avoid deficiencies by finding a fertilizer that contains all essential micro and macronutrients that cannabis plants need. Even though the nutritional needs of cannabis vary based on the strain, having these baseline nutrients will protect your plants from nutrient deficiencies.

Using excessive fertilizer can also cause issues that can result in the yellowing of cannabis leaves. However, this can be fixed by simply flushing the soil with water to eliminate nutrient buildup in the soil.

Read next: Best Bloom Boosters Nutrients for Marijuana Growth

-$10.10 SALE OFFBestseller No. 1
FoxFarm Liquid Nutrient Trio Soil Formula: Big Bloom, Grow Big, Tiger Bloom (Pack of 3-16 oz Bottles) + Twin Canaries Chart
14,426 Reviews on Amazon
FoxFarm Liquid Nutrient Trio Soil Formula: Big Bloom, Grow Big, Tiger Bloom (Pack of 3-16 oz Bottles) + Twin Canaries Chart
  • Get your garden going with FoxFarm Grow Big, our liquid concentrate fertilizer that supports lush vegetative growth.
  • FoxFarm Big Bloom Liquid Plant Food is formulated for use on all plants and can be used every time you water. OMRI Listed and Registered CDFA Organic Input Material.
  • FoxFarm Tiger Bloom is a phosphorus fertilizer that contains nitrogen to support vigorous growth. FoxFarm Tiger Bloom is designed to encourage abundant fruit, flower and multiple bud development.
  • FoxFarm Big Bloom, FoxFarm Grow Big, and FoxFarm Tiger Bloom, together at last. Designed to work together to support vigorous growth, multiple bud development and abundant fruit.
  • Twin Canaries Conversion Chart included with every order.
Bestseller No. 2
Advanced Nutrients ANBGMBD500 Bloom, Micro, Grow Fertilizer Bundle, 500ml Each, Original Version
1,934 Reviews on Amazon
Advanced Nutrients ANBGMBD500 Bloom, Micro, Grow Fertilizer Bundle, 500ml Each, Original Version
  • 500 ml bundle set
  • Lush, sturdy growth from 3-part nutrients designed specifically for high value
  • 3 part solution: You get advanced nutrients bloom, micro and grow
  • State-of-the-art carrier molecules to ensure their plants get the maximum amount of nutrients
  • You will never have to worry about your pH again
Bestseller No. 3
Advanced Nutrients GL525050-12 Big Bud Liquid Fertilizer, 250 mL.250 Liter, Brown/A
7,695 Reviews on Amazon
Advanced Nutrients GL525050-12 Big Bud Liquid Fertilizer, 250 mL.250 Liter, Brown/A
  • Larger, heavier, denser flowers
  • Flowers with more essential oils, aromatics, terpenoids, phenols and other potency factors
  • Measurable, significant increases in overall harvest weight and market value
  • No assembly required
-$23.00 SALE OFFBestseller No. 4
Growth Science Nutrients - Starter Pack
89 Reviews on Amazon
Growth Science Nutrients - Starter Pack
  • This starter pack is intended to get you off the ground with your garden. It contains four of our tried-and-true fertilizer products that successful growers, on all scales, have come to depend on.
  • Made from the highest quality ingredients, specifically formulated to save you time and money. For use in soil, coco and all hydroponic mediums.
  • It’s essential to provide the right nutrients at the right stages of growth. Growth Science will walk you through those steps with this, cost-effective starter pack.
  • Each pack contains 5 bottles. 1 pint of Base A, 2 pints of Base B, 1 pint of Solid start, and 1 pint of rock solid
  • Base A and B form the foundation of the Growth Science system. Together they provide your plants with essential macro and micro nutrients essential for growth.
-$9.00 SALE OFFBestseller No. 5
Fox Farm Plant Fertilizer Soil Bundle: Big Bloom, Grow Big, Tiger Bloom, Cal-Mag (Pack of 4 - 16 oz Bottles) + Twin Canaries Chart
315 Reviews on Amazon
Fox Farm Plant Fertilizer Soil Bundle: Big Bloom, Grow Big, Tiger Bloom, Cal-Mag (Pack of 4 - 16 oz Bottles) + Twin Canaries Chart
  • Big Bloom Liquid Plant Food is formulated for use on all plants and can be used every time you water. OMRI Listed and Registered CDFA Organic Input Material.
  • Grow Big is a liquid concentrate fertilizer that supports lush vegetative growth.
  • Tiger Bloom is a phosphorus fertilizer that contains nitrogen to support vigorous growth. Tiger Bloom is designed to encourage abundant fruit, flower and multiple bud development.
  • Bush Doctor Cal-Mag is a calcium and magnesium supplement that helps strengthen cell walls and aid in fruit development.
  • Twin Canaries Chart included with every order

When are Yellow Cannabis Leaves Considered Natural

When cannabis seedlings are growing, the cotyledons are usually the first leaves to appear. As the seedling grows, the cotyledons will yellow and fall off. Cannabis leaves that are not getting adequate light will also start yellowing. These leaves should be removed if you are unable to find a way of penetrating light to these leaves. During the cannabis growing process, you may notice isolated yellow leaves that can be caused by the accidental snapping of leaves by the grower and this is normal.

In the last weeks of flowering, some cannabis leaves can naturally turn yellow as the plants reach the final phase of life. This occurs because the plants are more focused on reproduction and gathering nutrient resources into flowers or seeds.

In Conclusion

Whether you are a pot veteran or new grower, cultivating your own pot can be quite a rewarding and enjoyable experience. However, it can be nerve-wrecking when the bright green leaves turn yellow and pale. However, as a grower, you should never panic or worry when you see your marijuana plants having yellow leaves.

The yellowing of leaves does not always mean your marijuana plants will die or wither away. In some cases, the yellowing of cannabis leaves can be a natural phenomenon or can be unintentionally caused by marijuana growers. Remember that cannabis leaves can turn yellow for no specific reason and may cause no harm to the plants.

If you notice your marijuana leaves are turning yellow, ensure that you determine the underlying problem. Addressing the problem can save your cannabis plants from complete ruin. Be sure to apply the above tips to help you stop yellowing of marijuana leaves before it eliminates your plants.

Read next: Common Cannabis Seedling Problems

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