It seems like everything is equally important when it comes to growing weed. But, the fertilizer and nutrients are vital to the health of your plants and will directly affect your growth potential and potency.

The right fertilizer can make a huge difference,and the right cannabis nutrients will help your plants flourish. We’ve done all the research and gathered the best cannabis nutrients and fertilizers for growing weed in 2019.

Top 15 Best Nutrients and Fertilizers for Cannabis 2020

You can find a good fertilizer for soil or hydroponics growing with a little bit of research. But, we’ve done all the research and believe that the 15 products here are a benefit for most people growing weed. Whether it’s your first grow, or you’re experienced and looking for something new, these products are some of the best on the market.

1. Fox Farm Liquid Nutrient Tio Soil Formula

Fox Farm is a well-known, and well-respected brand in the growing community. Many growers used these 3 formulas in their first grow and continued to use them for years after. The price, simple formula, and versatility make Fox Farm a top choice for any first-time grower. Not to mention the many experienced growers who still enjoy using it.

  • Hydroponic growing option available
  • Versatile to any strain
  • No experience necessary

What We Liked

Fox Farm’s formulas work together to deliver top-notch results. The 3 formulas used here deliver big buds and thriving plants. What we liked specifically was the attention to the vegetative stage. Many formulas ignore the importance of healthy vegetation and focus on producing big buds.

What We Didn’t Like

There’s nothing to dislike about the Fox Farm formulas. 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.

Our Final Thoughts

Overall the Fox Farm Liquid Nutrient Trio Soil Formula is a top option for new growers. Although many experienced growers move on to either more expensive formulas or eventually create their nutrients, this formula is a great starter. You can also use the Big Bloom nutrient additive throughout the entire growth cycle.

If you’re worried about overfeeding, Fox Farms has minimal risk of overfeeding your plants. The Tiger Bloom, Grow Big, and Big Bloom formulas use design to allow new growers to have great experiences with their plants.

2. General Hydroponics Organics Go Box

From General Hydroponics, the General Organics Go Box is the first choice for many growers for a few reasons. Frist, the brand has a ton of experience in designing fertilizers for weed. Hands down this are one of the best nutrients and fertilizers for growing weed.

But the things to love about it keep going, so if you’re unsure of what option to choose the General Organics Go Box can help guide you towards which nutrients or fertilizer your plants respond best to. If you’re starting out, it’s easy to see how the General Organics Go Box is still the first choice for many growers.

  • 1 pack contains 8 nutrients bottles
  • Organic

What We Liked

The all-organic formulas are great because it’s difficult to find such a diverse set of products that are still organic. Many growers have concerns with ingestion safety when it comes to what they use on their plants.

With the all organic matter formulas, there’s no concern about which products are safe or not. If you by chance get a box that is missing any of the products or has 2 of one product instead, be sure to contact General Hydroponics. They’re well known for taking care of their customers.

What We Didn’t Like

There is nothing to dislike about this set of liquid fertilizer and nutrients. It works well for both hydroponic nutrients, soil fertilizer and alternatives like cocofiber.

The price is right and very reasonable given the all organic formula. Although it’s important to note that 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 or chosen substrate. General Hydroponics continues to make great fertilizers and nutrients for weed plants. The development that went into these products is apparent.

Overall, this is a quality purchase,and if anything does go wrong, the company is easy to contact. Not to mention they have outstanding customer service.

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

This is the original 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 super ingredients: FloraBloom (for flowering and/or fruiting), FloraMicro (growth & bloom), and FloraGro (for vegetative growth).

This combination comprises 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 Liked

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

4. Technaflora Recipe for Success Starter Kit

The Technaflora is the perfect recipe for first-time as well as experienced cannabis growers. The kit contains everything you need for successful gardening.

The kit comprises of the following parts: 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 also comes with a detailed mixing chart. The chart shows you how to successfully and effectively use the available nutrients in combination so as to maximize benefits.

For 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.

Then you have thrived alive b-1 green and red, which is basically an all-around plant tonic. It has hormones and micro/macro nutrients. It is great for foliar spraying or use as a retrench.

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 Liked

  • Some of the bottles may be leaking
  • Mixing may be a little harder than you would have expected

5. Osmocote Flower & Vegetable Smart-Release Plant Food

If you are in search of a nutrient-rich formula that will help with flower and vegetative growth, you should look no further than the Osmocote.

This fertilizer is made up of nutrient granules that are coated with semi-permeable resin. The resin coating requires low soil temperature to react so as 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.

This is one of the easiest fertilizers to use. All you have to do is scatter a scoopful per four square feet, mix with the soil, and water the plants frequently.

The only thing that may be off about this mixture is the fact that this is a seasonal formula, which is most 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 suitable choice for perennials
  • Super easy to use coated nutrient granules
  • Suitable for containerized planting

What We Liked

  • May receive a torn plastic bag

6. Grow More Hawaiian Bud Plant Fertilizer

Grow large and smart with the Hawaiian Bud by Grow More. This plant fertilizer will boost your weed plants to maturity in an impressive, unique way.

It contains plant nutrients that are obtained 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
  • Formulated to provide strength nutrients for larger blooming
  • Compatible with multiple growing media

What We Didn’t Liked

  • Contains boron, which may injure your cannabis plants

7. Element Flower Fuel Plant fertilizer

This is a superior bloom booster 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

  • Consists of organics, vitamins, nutrients, and amino acids
  • Contains superior proprietary ingredients aimed at stimulating healthy plant growth
  • Soluble and 100% hydroponic bloom formula
  • Formulated to promote heavier, denser, and larger yields
  • Can be used in different growing media

What We Didn’t Liked

  • 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 and natural plant fertilizer for use when your cannabis plants are flowering. It contains all the important ingredients required for all growth stages.

It is multiple sources of fish meal, earth worm castings, and guano among other natural additions. It provides a wide range of beneficial microbes and plant food for your weed vegetation.

Unlike conventional plant foods/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

  • 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 media, including coco, soilless, and soil
  • Super easy to use and works wonders like a charm
  • Takes only a couple of days to arrive

What We Liked

  • May not break down fast enough
  • Not be ideal for indoor use

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 Liked

  • 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 desperately 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 Liked

  • 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 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.

Our 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.

Our 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.

Our 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
  • 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. Planning to compost or build your nutrients hardly ever works out and in the end, the plants suffer because of it.

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…

The clear winner here is the General Organics Go Box which comes with a wide variety of products to 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.

Finding nutrients to add to your plants is difficult if you’re not sure where to start. Because nutrients can both help and hinder growth many people,who are new to growing marijuana stay away from them. But, if you stick with well-known brands that use quality nutrients and well-developed formulas you’re at no risk of diminishing your plant’s growth.

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