Best Bloom Boosters Nutrients for Marijuana Growth

For a cannabis grower, one of the most critical periods of plant growth is the flowering stage. Whenever the cannabis plants leave the vegetative period and step into the flowering stage, buds will start to develop, and this gives you the cue to start treating them differently from changing the lighting to how you apply the nutrients. During the flowering stage, the cannabis plants are prone to experiencing more problems. Therefore, every action you perform cold either be beneficial or detrimental to its growth. The flowering stage takes approximately eight weeks and comprises five steps that include transition, development of first buds, the growth of the buds, the ripening of the buds and harvesting. During the flowering process, you need to give your plants the right amount of nutrients for you to get high quality buds. The nutrients that your cannabis utilizes are not necessarily similar to those that your plants require during the growing stage. During this stage, you cannabis plants need essential fertilizers that are widely known as bloom boosters. Since the flowering growth stage requires more phosphorous and potassium to attain vigorous growth, bloom boosters often present themselves in an N-P-K ration where the nitrogen is the lowest level of the three minerals.


It is of utmost importance that you get bloom boosters with the right nutrient ratio for you to experience the best results. For each growth stage, plants have a specific nutritional need. By providing the plants an optimal nutrient blend, you can maximize on attaining a good plant yield. Even for plants that have had a rough start, some bloom boosters can extend the plant’s flowering life and give it a significant energy boost that will increase its final yield. Here is a look at some of the BLOOM BOOSTERS FOR CANNABIS growth you can find in the market today.

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Organic Fertilizers

General Hydroponics GH5132 BioThrive Bloom

The General Hydroponics BioThrive Bloom provides cannabis plants in the flowering stage critical essential nutrients that can help the flowers bloom to their best quality and have a massive buds harvest. The formulation is pure and natural as it comes from mineral salts and plants. Some of these organic substances include; cane sugar, rock powder, alfalfa meal, molasses, kieserite, glacial rock powder, potassium sulfate, plant extracts, rock phosphate, soybean meal, zinc phosphate, sodium borate, copper sulfate, iron sulfate, sodium, and manganese sulfate. It works by encouraging microbial activity in the root zone. The General Hydroponics BioThrive Bloom can effectively operate in an indoor hydroponics system as well as in potting soil mixes. The bloom booster allows cannabis to experience maximum growth. Its essential nutrients contain enough carbohydrates to stimulate microbial activity. When using in a hydroponic system, it is advisable to use the booster with CaMg+ for hydroponic culture. Use two to four teaspoons for every gallon of water in every nutrient change. You should always ensure to provide enough air to the nutrient solution through a coarse bubble.

Maxicrop Pure Seaweed Extract Soluble Powder

If you are looking to provide your plants with naturally occurring vitamins enzymes and minerals, you should then consider acquiring the Maxicrop Pure Seaweed Extract Soluble Powder. The powder comes from the Norwegian Ascophyllum nodosum seaweed and analysis indicates the nutrient ratio to be 0-0-17. The Organic Materials Review Institute (OMRI) has listed the Maxicrop Pure Seaweed Extract Soluble Powder for its use of certified organic products. It supplements the fertilizer program you currently have in use and provides benefits to the plants from plant propagation to harvesting. It is purely soluble and non-polluting. It works by stimulating the growth of cells in both the stem and roots. It contains trace elements from the seaweed as they can activate enzymes.

Synthetic Fertilizers

JR Peters Inc 51024 Jacks Classic No.1.5 10-30-20 Blossom Booster Fertilizer

The Jacks Classic Blossom Booster Fertilizer is a product by JR Peters Inc; a family owned business that has been in operation since 1947 in the horticultural industry formulating and manufacturing the highest quality of water-soluble fertilizers. The Jacks Classic Blossom Booster Fertilizer being one of the products helps a plant to produce more flowers and of brighter color. Its intake can be through both the roots and leaves. The blossom booster comes with a nutrient ratio of 10-30-20 that provides a quality trusted by many professional cannabis growers. To attain the best results, you should use half a teaspoon of the fertilizer for every gallon of water every day for a period of 7 to 14 days. The fertilizer is inexpensive making it a favorite among many cannabis growers.

Flower Fuel 1-34-32, 250g

The Flower Fuel is a premium bloom booster that is consists of more than 40 ingredients that consist of amino acids, nutrients, organics, and vitamins. The Flower Fuel is 100 percent made for use in a hydroponic system making it a go-to fertilizer for many indoor cannabis gardeners. The fertilizer comes in the ration of 1-34-32 which is useful in promoting heavier and denser harvests that contain more resin content and essential oils. The formula can treat 200 gallons of water and guarantee amazing cannabis harvests.

Fox Farm FX14049 Liquid Nutrient Trio Soil Formula: Big Bloom, Grow Big, Tiger Bloom

The Fox Farm Liquid Nutrient Trio Soil Formula is a three solution product where they all work in different growth phases to help the plant grow more substantial, thicker and attain more harvests. The buds in a cannabis plant become denser after continuous use of this fertilizer. Unlike many other products, you can use the Fox Liquid Nutrient Trio Soil Formula during the latter part of plant growth. When you compare the Fox Farm Liquid Nutrient Trio Soil Formula to other chemical fertilizers, it is softer since it does not contain high levels of phosphorous. It contains nutrients that are readily available together with active microbes and organic ingredients. Many users that have used the fertilizer before have had only compliments to make due to the positive results they all achieved. When compared to other products in the market, the cost is relatively cheap. To attain the best results, you should use 2 to 4 teaspoons of fertilizers per gallon of water. You should start the use of the fertilizer with the grow big hydro, to help with providing an abundant cannabis green growth, then follow it up with the Tiger Bloom immediately you spot the first signs of buds or flowering.  You need to use the Big Bloom throughout the growing cycles to help with the healing of the roots and increasing the nutrient cycle.

Grow More 7508 Hawaiian Bud 5-50-17

The Grow More Hawaiian Bud is a specially made fertilizer that helps to provide plants with the necessary supply of potassium and phosphorous that is useful in the late stages of flowering. The fertilizer formula is made up of humic acid, Norwegian kelp extract and six trace elements that can help increase the production of flowers and buds in cannabis. It comes with a nutrient ratio of 5-50-17 that helps in producing more resins and essential oils for a better cannabis harvest. The fertilizer is for use in soilless hydroponic and aeroponic systems. You can use it through both foliar and fertigation methods wherein foliar you use one teaspoon per gallon and in fertigation one tablespoon per gallon of water for one month.

Osmocote Flower and Vegetable Smart-Release Plant Food

A lot of inorganic fertilizers in the market do not last for a long time after application making it necessary for regular reapplication. The Osmocote Flower and Vegetable Smart-Release Plant Food is however different from the rest. It comprises of a slow-release granule fertilizer that can feed the plants for four months. It promotes vigorous top growth and helps in developing the roots. The granule fertilizers have a coating of a semi-permeable resin in which inside it contains the required nutrients. Water gets through the surface dissolving all the nutrients in the granule. The nutrients get released with the changes in temperature in the grow tent with more nutrients coming out during warmer and active growing periods. It comes with a nutrient ratio of 15-9-12 that helps cannabis plants grow bigger and have bountiful buds all through the season.

Choosing a Bloom Booster for your Cannabis Plants

Every macronutrient has a specific role to play in the development of your flowers. Some plants require a higher ratio of potassium to phosphorous while others require more elevated amounts of phosphorous to potassium to survive. Therefore, when choosing a bloom booster for your cannabis plants, you need to be extra careful about what you pick. Whenever you make the wrong choice and select the wrong ratio, you risk placing your plants through various problems.

Whenever your cannabis plants intake too much nitrogen, they can suffer from toxicity caused by nitrogen making the leaves to darken and curl on the edges. If you do not treat this problem, the leaves with change color to yellow and the plant will eventually wither away and die. When the phosphorous is too little, yellowing will also occur on the leaves, and the plants will experience stunted growth. They become even more vulnerable to attacks by pathogens.  Similarly, when you provide your cannabis plants with too much phosphorous they can also experience stunted growth and lock out the absorption of magnesium and zinc which are essential nutrients that help with making a plant grow stronger and healthier. When your plants experience a deficiency in potassium, the leaves weaken and break with ease. They also become more susceptible to attacks by pests and pathogens. Too much potassium, on the other hand, blocks the absorption of micronutrients that are useful in plant growth.

Comparison between Organic and Chemical Nutrients

With all the different fertilizers at your disposal, you may commonly find yourself torn between choosing a chemical fertilizer or an organic fertilizer. Which one between the two is better? The decision between the two fertilizers mostly comes to personal preference. The two have their advantages and disadvantages.

Organic Nutrients

Organic fertilizers come from natural sources such as vegetable and animal waste. These wastes contain beneficial nutrients for the growth of plants. They can also come from mineral rock dust and gypsum which are also organic fertilizers. Several benefits arise from using organic fertilizers as compared to chemical fertilizers. For one, they release natural nutrients in a slow process reducing the chances of overfeeding the plants or causing a nutrient burn. It makes using organic fertilizers safer and a suitable method for use by new cannabis growers. Most cannabis growers reveal that by using natural nutrients, their cannabis plants increase in their flavor profile as well as the yields.

Additionally, several cannabis growers prefer organic growing since it helps to improve the soil giving them the ability to reuse the land for more than one growing season. It also provides the user with peace of mind for not relying on any chemicals or artificial substances during growth since there will be no chemical substances to enter their body whenever they use cannabis.

Even so, certain drawbacks come with using organic nutrients. Organic nutrients rely on micro-organisms to breakdown the required nutrients resulting in more extended absorption periods. It becomes a problem especially is a situation where the plant is deficient of BLOOM NUTRIENTS, and it needs the problem to be solved as fast as possible. It becomes harder to manage the process when you use the method of growth in cold regions as the organic nutrients become less effective.

Organic fertilizers also tend to attract insects and pests increasing the chances of the growth of harmful fungi and algae on the cannabis plants. Finally, the fertilizers are more expensive compared to synthetic fertilizers.

Chemical Nutrients

Chemical nutrients are made up of exact ratios of specific nutrients giving the grower control over the number of nutrients the plants receive in their particular growth stages. A good example is during the growing stages of cannabis; plants require more nitrogen than any other nutrients, and in the flowering stage, they need more phosphorous to aid in the growth of bigger and bulkier buds. By giving the plants the right amounts of nutrients that are required, your plants will experience bigger yields and a higher THC content. You should always remember that different cannabis strains have different nutrient requirements.

The nutrients are readily available upon introducing the fertilizer to the plants. Therefore, in the event of any deficiency, the plants can address the problem without wasting any time. Chemical fertilizers are readily available and cheaper than organic fertilizers. Just like any other item, chemical fertilizers also have disadvantages. They can at times lead to overfeeding and nutrient burn which can occur when you introduce the synthetic fertilizers to plants in concentrated levels. They also diminish and weaken the soil quality allowing the nutrients to run-off thereby harming the environment. Chemical fertilizers do not come from renewable sources. The production of nitrogen, for instance, affects the environment in negative ways.

Which to Choose?

Deciding between organic and chemical nutrients is a difficult choice to make. When you look at it on an environmental view, natural nutrients take the win since they increase the health of the soil over time. Outdoor cannabis growers prefer using these type of nutrients since they will continuously use the same land to grow their cannabis plants. Indoor cannabis prefers the use if hydroponic nutrients that are made specifically for use in hydroponic environments. These nutrients contain more traces of micronutrients and are made up of chelated minerals which are treated making them easier to absorb. Chelated nutrients come with a wrapping of an organic molecule that protects the nutrients from the pH level in the water making it easier for the plants to absorb. The nutrients are not made from natural sources since there are no microorganisms in a soilless environment to breakdown the minerals. They also have lower levels of phosphorous and higher levels of nitrogen. However, the levels of nitrogen should be low in the flowering phase since it can suppress the formation of buds in cannabis lowering the yields.

Frequently Asked Questions

What is the best nutrient ratio for the flowering stage of cannabis?

During this period, nitrogen should be the lowest. A beneficial N-P-K ratio formula is 1-3-2 in the early stages of flowering up until the mid-blooming stage and a 0-3-3 in the last stages of blooming. Finally, you can give the plants a light flushing solution together with fresh water in the final week before harvesting.

How long is the flowering stage?

When planting your cannabis indoors, the flowering period begins the moment you start switching your grow lights for equal 12 hours of daylight with 12 hours of darkness. Depending on the cannabis strain, the period can last for seven to nine weeks.


Many organic cannabis growers state that natural nutrients are the best as they deliver a higher quality weed by synthetic cannabis growers also claim that chemical nutrients are better since they lead to faster growth and larger yields. As the debate between which is better between the two continues to progress, the only option you have is deciding by evaluating your budget and personal preference.

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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

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