The soil you use when growing cannabis might be the foundation of your plants, the soil you use only works as well as the fertilizer you’re using within it. The fertilizer and nutrients you use to nourish your plants are vital to the health of your plants and will directly affect your plant’s potency.

Fertilizing your plants with the right nutrients can help them flourish. Without the proper nutrients, you might spend a lot of time cultivating plants that end up not being as potent as you would have hoped.  Luckily, we’ve done the hard work for you. In this article, we’ll break down the best nutrients and marijuana fertilizers for growing cannabis plants in 2020.

Top 15 Best Nutrients and Fertilizers for Cannabis 2020

Sure, you can spend your time conducting experiments and researching the best fertilizers and nutrients for your specific cannabis seeds. But in the process of all of this testing, you will spend a lot of time and even more money trying to figure out what works. We’ve compiled all of the best information based on our own research and personal experience to curate this list of some of the best nutrients and fertilizer products on the market.

Depending on the strain you are trying to grow and the make-up of your grow space, you can use this information to choose the product that’s right for you.

1. Fox Farm Liquid Nutrient Trio Soil Formula

Fox Farm is a well-known, and well-respected brand in the growing community. They attract a lot of new growers who continue to use them well into their growing practice. The main reason that people continue to choose this brand is because of their low-price point, high-quality formula, and versatile line of products. They have hydroponic blends and use nutrients that cater to a lot of different strains. Using their products requires a low learning curve so even the most inexperienced growers can grab a bag, read the instructions and incorporate this fertilizer into their plants.

What We Liked

  • Hydroponic growing option available
  • Wide range of products
  • Great price point
  • Versatile to any strain
  • No experience necessary
  • Create healthy vegetation
  • Focus on producing big buds

What We Didn’t Like

  • They don’t make much distinction on how to use the nutrients throughout different stages
  • Requires a bit more research when dealing with longer flowering times

Our Final Thoughts

There’s not much we dislike about Fox Farm. The price is right, the advanced nutrients are stable, and the formulas are simple. If there was anything to nitpick at it’s that many first-time growers don’t know when to switch from one stage to another.

We recommend speaking with other growers and watching your plants for specific signs that it’s time to move on to the next round of nutrients. You don’t want to risk missing out on the opportunity to nourish your plants.

2. General Hydroponics Organics Go Box

The General Organics Go Box is a go-to choice for a lot of first-time growers because the brand has decades of experience producing products that are specific to growing weed. It’s an all-in-one solution for growers who aren’t sure where to start when it comes to using specific nutrients in their growing process. It’s an organic mix of fertilizer and nutrients that comes with 8 bottles of nutrients in each pack.

What We Liked

  • All-organic formulas
  • Safe to ingest
  • Excellent customer service
  • Quality guarantee and return policy
  • Works well for both hydroponic nutrients, soil fertilizer and alternatives like cocofiber.
  • Reasonable prices

What We Didn’t Like

  • Not all the formulas are OMRI certified.
  • Organic Hydroponics has noted that the lack of certification on some of their products is due to the cost of certification

Our Final Thoughts

The Go Box is a top choice for growers regardless of experience. General Hydroponics continues to make great fertilizers and nutrients for weed plants. The development that went into these products is apparent.
Overall, we stand behind this product because if anything does go wrong, the company is easy to contact and has outstanding customer service.

3. General Hydroponics Flora Gro, Micro, Bloom Combo Fertilizer Set

This set is one of the original nutrient sets that was popularized by indoor cannabis growers back in the day. It’s a comprehensive three-part building block nutrient system for your weed plants. It is one of the most popular formulations, thanks to its unique ingredients and consistent performance.

The Flora Series contains three ingredients: FloraBloom (for flowering and/or fruiting), FloraMicro (growth & bloom), and FloraGro (for vegetative stage growth). This combination is made up of highly purified concentrates for supreme solubility. The pH of the elements is properly balanced for superior formulation as well as reliability.

Different combinations of the Flora Series allow you to provide your plants with the appropriate nutrients with respect to the growing environment and growth stage. This high-performance fertilizer will ensure that your weed receives the perfect balance of secondary, primary, and micronutrients.

What We Liked

  • High-performance three-part fertilizer for veg, flowering, and fruiting
  • Greatly purified concentrates are highly purified
  • Properly balanced pH levels for superior formulation and reliability
  • Suitable for all grow media
  • Stimulates structural as well as vegetative growth
  • A preferred choice for Antarctic and NASA research scientists

What We Didn’t Like

  • Bottles may have broken factory seals
  • Bottles are smaller for the price

4. Technaflora Recipe for Success Starter Kit

This Technaflora kit lives up to its name by being the perfect starter kit to ensure success in your harvest. It’s the perfect recipe for first-time as well as experienced cannabis growers. The kit contains everything you need for successful gardening.

The kit of the following ingredients and nutrients: root 66, sugar daddy, magical, Rotech cloning gel, awesome blossoms, thrive alive b-1 green and red, B.C grow, and B.C boost.
The package comes with a detailed mixing chart that’s easy enough for new growers to understand and follow. The chart illustrates how to successfully and effectively use the available nutrients together to maximize benefits.

If you’re focused on vegetative growth, you can use the root 66, B.C grows and B.C boost, and in flowering, you can use the awesome blossoms and B.C boost. The magical nutrient, which is a mixture of calcium and magnesium, is going to help with vigor growth, thicker stocks, and stronger stems.

The sugar daddy is a mixture of about twenty amino acids and some part of carbohydrates amongst other things to help increase overall plant health.

What We Liked

  • High-performance ten-part organic fertilizer
  • Detailed mixing chart for ease of combination to maximize benefits
  • Root 66, B.C grow, and B.C boost promote veg growth
  • Magical nutrient stimulates vigor growth
  • Sugar daddy increases overall plant health
  • Thrive alive b-1 is great for foliar spraying

What We Didn’t Like

  • Some of the bottles may arrive leaking or damaged
  • Frequent users report issues mixing the ingredients together

5. Osmocote Flower & Vegetable Smart-Release Plant Food

Osmocote is a nutrient-rich formula that helps with flower and vegetative state growth. The fertilizer is made up of high-nutrient granules that are coated with semi-permeable resin. The resin coating requires low soil temperature to react and to provide your plants with nutrients.

The coating allows water to easily enter the granules as well as dissolve the encapsulated nutrients. When the nutrients are dissolved, they are released with respect to changes in temperature. Normally, a greater percentage of the nutrients is freed during warmer growing periods. We love this brand because it’s one of the easiest fertilizers to use. Just scatter a scoopful per four square feet, mix with the soil, and water the plants frequently. The only downside to this mixture is that it has seasonality to it. It’s much more suitable for perennials and seasonal plants.

What We Liked

  • Stimulates strong root development and vigorous top growth
  • Formulated for colorful blooms and flavorful vegetables
  • A great choice for perennials
  • Comes with easy-to-use coated nutrient granules
  • Suitable for containerized planting

What Didn’t Like

  • The packaging is not always secure
  • Not suitable for annual plants or summer harvests

6. Grow More Hawaiian Bud Plant Fertilizer

The Grow More Hawaiian Bud Plant Fertilizer promises to help you grow larger buds without as much work as other marijuana fertilizers. The blend contains plant nutrients from seaweed extract, zinc EDTA, manganese, iron EDTA, copper EDTA, sodium molybdate, boric acid, potassium sulfate, ammonium sulfate, potassium phosphate, and ammonium phosphate.

This formula is recommended for use during the late flowering period. Basically, it is formulated to provide additional strength nutrients to your cannabis plants, producing a larger bloom. It is one of the most versatile formulas in the market. You can use it in aeroponic, coco coir, organic soils, hydroponics, and soilless systems.

Application is super easy. Just add the formula to your desired volume of water, then agitate the water until the formula is dissolved.

What We Liked

  • It is water-soluble and urea-free
  • Presence of humic acid is suitable for hydroponics systems
  • Perfect for injection of fertilizer as well as foliar applications
  • High bloom fertilizer designed to produce bigger plants
  • Compatible with multiple growing media

What We Didn’t Like

  • Contains boron, which may be detrimental to your cannabis plants if used long-term

7. Element Flower Fuel Plant fertilizer

The Element Flower Fuel Plant fertilizer consistently produces plants that grow big blooms and more potent flowers. It’s a unique mixture that contains organics, vitamins, amino acids, and nutrients. It is formulated to generate heavier, denser, and larger cannabis yields. It is the ideal bloom additive that delivers fuel for the growth as well as the development of your small or large weed sites. It is formulated to work wonders in hydroponics, coco coir, peat, and soil-based systems. Not to mention that it works just fine with any base nutrients.

This formula is obtained from citric acid, glycine, kelp, sodium molybdate, boric acid, magnesium sulfate, potassium sulfate, and monopotassium sulfate. This high-performance fertilizer is a hundred percent hydroponic grade as well as soluble bloom plant food that can treat two hundred gallons of water.

What We Liked

  • Contains vitamins, nutrients, and amino acids that support plant growth
  • Includes superior proprietary ingredients aimed at stimulating healthy plant growth
  • 100% hydroponic bloom formula
  • Formulated to promote heavier, denser, and larger yields
  • Can be used with different growing mediums

What We Didn’t Like

  • Doesn’t contain calcium and sufficient nitrogen required for healthy green leaves

8. J R Peters Inc. Jacks Classic Blossom Booster Fertilizer

This is a professional plant formula that is formulated to generate more flowers as well as brighter colors on your cannabis plants.

It feeds through leaves and roots. This superior blossom booster has a proven nutrient ratios of 1:3:2, and the quality is unrivaled compared to conventional fertilizers.

It is derived from calcium carbonate, ammonium molybdate, copper EDTA, zinc EDTA, manganese EDTA, iron EDTA, boric acid, magnesium sulfate, potassium nitrate, mono-potassium phosphate, and mono-ammonium phosphate.

For the best cannabis yields, you are advised to apply every seven to fourteen days. You can use the formula during bud set in order to increase the number as well as the size of the blossoms.

For indoor weed plants, use a quarter teaspoon for every gallon of water every time you wet your cannabis plants. You can learn more from the provided instructions manual.

What We Liked

  • Superior nutrient and npk ratio promotes optimum growth
  • Suitable for indoor as well as outdoor cannabis plants
  • It feeds through leaves and roots for maximum absorption
  • Promotes a longer flowering period
  • Easy application for indoor or outdoor plants

What We Didn’t Liked

  • May not be compatible with all growing media

9. Botanicare Growilla Veg & Bud Plant Fertilizer

This is an organic plant fertilizer designed specifically to use on cannabis plants in the flowering phase. It contains all the ingredients required for plants to thrive in all growth stages, but it’s purposefully designed to aid plants while they are flowering. It contains fish meal, earth worm castings, and bat guano and other natural ingredients that provides a wide range of beneficial microbes and plant food for your weed vegetation.

Unlike conventional plant foods and fertilizers out there, the Growilla Bud is formulated to safely and effectively supply your plants with the necessary nutrients for development. It is designed for use in coco coir, soilless mixes, and soil garden-based grow media. You can also use it along with other bloom supplements you desire to promote healthy flowering.

What We Liked

  • It’s an organic and natural plant fertilizer that’s safe for your weed
  • It is a rich source of fish meal, earthworm castings, and guano
  • Can be used with multiple grow mediums, including coco, soilless, and soil
  • Fast shipping times

What We Liked

  • May not break down fast enough
  • Strong odor makes it not ideal for use in small, indoor spaces

10. General Hydroponics GH5312 CaMg+ Plant Nutrition

Are you in search of a calcium and magnesium supplement for your cannabis? Look no further than the General Hydroponics CaMg+.

This formula will help to optimize the nutrition of your weed plants, resulting in superior growth as well as vibrant flowering.

This formula is a blend of magnesium and calcium. Therefore, you can use it whenever your plants require extra soluble magnesium and calcium.

Apart from magnesium and calcium, this formulation also contains sugar chelates and organic acids. The acids are low molecular weight and may facilitate fast transport of the supplement into the plant.

Application is a bit straightforward. Add one teaspoon of the supplement per gallon of water for light feeding, and two teaspoons per gallon for heavy feeding.

What We Liked

  • Optimizes plant nutrition to enhance growth and flowering
  • Easy application, 1 tsp. for light feeding, 2 tsp. For heavy feeding
  • Organic acids facilitate fast transport into your cannabis plants
  • Suitable for most growing media

What We Didn’t Liked

  • May experience a significant drop in pH after mixing

11. General Hydroponics BioThrive Plant Food

The BioThrive Plant Food by General Hydroponics provides your weed plants with essential nutrients that are necessary for blooms and larger yields.

This vegan formula stimulates beneficial microbial activity within the roots. Not to mention that it can be used with a wide range of potting mixes and garden soils.

This formula is derived from soybean meal, sodium molybdate, rock phosphate, potassium sulfate, potassium borate, molasses, magnesium sulfate, ferric sulfate, and alfalfa meal.

It also comprises of non-plant food ingredients for feeding soil microbes, such as cane sugar and humic acids (obtained from Leonardite).

Application is stress-free. Add two to four teaspoons of the formula per gallon of water when feeding hydroponics systems.

For potting mixes, add four teaspoons per gallon of water during heavy feeding, and two teaspoons per gallon of water during light feeding.

What We Liked

  • It is a natural and pure vegan formula that will not harm your plants
  • Benefits all plants during blossoming and fruiting
  • Mineral and plant extracts stimulate beneficial microbial root activity
  • Easy application for both hydroponics and potting mixes

What We Didn’t Like

  • May experience problems balancing pH

12. Maxicrop Pure Seaweed Extract Soluble Powder

This Maxicrop plant food is formulated from the premium seaweed reaped from the Norwegian coastline. An ingredient that your cannabis needs.

According to the manufacturer, this supplement has 17% soluble potash that is suitable for grow rooms containing weed and other houseplants.

It contains natural growth stimulants that not only initiate cell growth but also promote fast growth of stem and roots.

Another impressive attribute of this plant food is the ability to be mixed with other fertilizers. For example, you can effectively mix this with Azomite.

This product can be used in different growth media, including aquaponic systems. A wide range of fish species will thrive in this mixture, including bluegill and tilapia.

What We Liked

  • Made of premium seaweed that is very beneficial to plants
  • Natural growth stimulants promote fast stem and root development
  • Can effectively be mixed with other fertilizers, such as Azomite
  • Works great with aquaponic systems

What We Didn’t Like

  • The powder form of Maxicrop may not be suitable for foliar application

13. Cutting Edge Solutions UJB:2603 Uncle John’s Blend Growing Additive

Uncle John’s Blend Growing Additive from Cutting Edge Solutions uses Potassium to stimulate healthier photosynthesis cycles. Because you’re increasing the metabolic rate of your plants, you can expect a healthier, and more perky, plant. The low molecular weight attributes to a clean spray that doesn’t sit heavily on the plants.

It’s also difficult to overfeed with a potassium mixture. Although using Uncle John’s Blend Growing Additive is only necessary twice a week, many marijuana growers report using it more often without any issue.

  • Complex, the potassium-based mixture
  • Increases metabolic rate
  • Low molecular weight

What We Liked

There’s so much to love about Uncle John’s Blend Growing Additive. Cutting Edge Solutions outdid themselves with this formula. First, we appreciate the clean spray as it doesn’t leave a heavy build-up on your plants.

Second, we like how the formula doesn’t try to overload the plants with nutrients. Instead, it uses potassium to stimulate healthy photosynthesis. Finally, we like that it’s usable throughout the entire growth cycle. You can keep giving it to your plants,and it’s not a detriment to their bloom or vegetation states.

What We Didn’t Like

The only thing we don’t like about Uncle John’s Blend Growing Additive is the price. Although nutrients are an investment in your plant’s well-being and ultimate bloom, these are pricey. The formula doesn’t claim to use organic compounds which might warrant the price.

Final Thoughts

Overall Uncle John’s Blend Growing Additive from Cutting Edge Solutions is an amazing nutrient additive. The quality is above standard, it’s difficult to overfeed, and you can use the same formula throughout the growth cycle.

These qualities combine to make a perfect formula for first-time growers. If you’d rather spend a bit more money to ensure you grow cannabis that’s high quality, Cutting Edge Solutions makes a great formula.

There are a variety of other options from Cutting Edge Solutions as well. Our pick for the potassium-based formula was the focus on improving photosynthesis. Because it’s the basis for all plants nutrient absorption, this product is the best option for creating the right environment for healthy plants.

14. Orga Grow Holland Organic Nutrients For Marijuana Plants – Liquid Fertilizer For Hydroponic

From Orga Grow Holland, we have organic nutrients and liquid fertilizer option. This formula was developed in Holland through years of trial and error. Although they advertise it as made for any plant, it’s specifically designed for cannabis growth.

The formula here is a 3-step system to aid your plants from initial planting and well into their bloom. The first step is a root stimulator which acts to encourage root growth and generation.

The second step is a growth stimulant. The growth stimulant will help you produce a higher yield. The third and final step is an abundant flowering formula.

  • Simple formula
  • Organic
  • 3 step growth system

What We Liked

We like that this formula is a full system. For experienced growers who can accurately track their plant progression and identify when nutrients are necessary this setup is a great option. The root stimulator isn’t a formula you see very often.

Getting your plants to take root properly is a frustration that many growers share. The root stimulator is the biggest win from this formula.

What We Didn’t Like

We don’t like that this doesn’t offer a lot for the new growers. If you’re new to growing, you might miss key signs that indicate it’s time to switch to the next step. There is a risk with both the growth stimulant and that flowering formula of overfeeding.

These issues kept the Orga Grow Holland formula from being the best nutrients and fertilizer for growing weed.

Final Thoughts

For the price, this is a quality product. It’s organic and is easy to use in coco fiber, soil, clay pebbles and hydroponic systems. The product itself is versatile, but it relies on the user to have some knowledge about proper feeding and handling of cannabis.

The Orga Grow Holland isn’t exceptionally well-known, but it offers quality organic products that can assist experienced growers in increasing their yield and boosting their flowering phase.

15. 13Essentials Foliar Spray Fertilizer

This formula isn’t intended for marijuana use specifically. The 13Essentials formula does wonders for nearly any plant though. With 13Essentials you can be sure that your plants are getting nearly all the macronutrients and micronutrients they need. It’s difficult to overfeed with this nutrient option, although it is possible, so be careful!

  • Foliar feed system
  • 13 added nutrients
  • Designed for faster absorption

What We Liked

We enjoyed that the 13Essentials focused on what plant’s need to carry out their normal lifecycle. With Potassium and phosphorous as the base, it also uses boron, magnesium, calcium, iron, zinc, manganese, copper and more.

The wide array of macro and micronutrients in this formula is causing many growers to use 13Essentials.

What We Didn’t Like

Unfortunately, the price and the results don’t add up. The price is pretty steep considering that a container only holds one ounce. Then you must mix it down withthe teaspoon. However, each teaspoon significantly diminishes your one ounce supple.

Then the results are mixed. Sometimes it works great; the plants are receptive and slowa response to the additive. However, there are regular reports that the formula didn’t do anything.

Final Thoughts

If you’re looking for a fertilizer or nutrient additive that will have an outstanding impact on your plants, this is not the formula for you. However, if you’re looking for something a little extra to give your plants 13Essentials works well.

We don’t recommend this product to anyone trying to specifically increase their yield, bud growth, bud size or potency. The 13Essentials formula is purelyto ensure your plants are getting a large volume and variety of both macronutrients and micronutrients.

Value Section

What goes into choosing the right nutrients and fertilizer? There’s some consideration to a few key aspects including whether the nutrients are water soluble, and whether the fertilizer has all the key components that your plants need.

First and foremost, your cannabis plants need specific elements. These elements are referred to as macronutrients which cover both mineral and non-mineral elements. Essentially your plant needs:

  • Nitrogen
  • Hydrogen
  • Oxygen
  • Phosphorus
  • Sulfur
  • Potassium
  • Calcium
  • Carbon Dioxide
  • Magnesium

But, the 3 main nutrients that all cannabis plants need are nitrogen, potassium, and phosphorus. On every bag of fertilizer, you’ll see 3 number printed on the front, and these numbers represent what percentage of these nutritional needs the fertilizer provides. The order is always: Nitrogen, Phosphorus, and Potassium (NPK).

Because your plants need such a wide array of macronutrients it’s likely they can’t get everything they need just from fertilizer. This need has driven the growing community to develop several fantastic nutrient additions. When looking for the right nutrient to add to your fertilizer or water, the huge number of options can be daunting.

What you need from added nutrients is a water-soluble base. Whether the nutrients you’re giving your plants are liquid or tablets, they need to disperse with water. Because nutrients enter the plant through the root system most effectively many growers drip the nutrients into the water supply or soil.

Aside from the macronutrients, your plants also need a trace amount of these elements:

  • Chlorine
  • Cobalt
  • Boron
  • Iron
  • Zinc
  • Molybdenum
  • Silicon
  • Copper
  • Manganese

These elements contribute to the long-term health of the plant and help it through the flowering stage. Lacking in any one of these key micronutrients can greatly affect bud growth and potency. What you essentially want to do is create a diverse a healthy ecosystem of microbes for your plants.

If you’re new to growing, you should probably use a pre-made fertilizer with organic nutrients and materials. When it comes to composting, or creating your own nutrients, this route has a high risk of failure.  Finding the proper nutrients and fertilizer for your plants will be a labor of love, but hopefully, with these reviews, you can find the best options for you!

The Clear Winner…

Any of the products on this list will help you grow healthier and more potent plants. But one product, in particular, stands out as the most comprehensive, and easiest solution to incorporate into your growing.
Our pick for the top nutrient and fertilizer is the General Organics Go Box. We’re going with this one as the top choice because it comes which comes with a wide variety of products that you can use at various stages of growth. With root stimulant, vegetative growth support, and bio bud you can be sure that your plants are well taken care of at every stage of their lifecycle.

It’s not easy identifying the right nutrients to add to your plants. If you’re a new grower, then you might not even know where to look or where to start. We hope that by breaking down our top picks for the best fertilizers for growing marijuana that you have a resource to turn to that will help you grow your knowledge, and grow higher quality cannabis.

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