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Best Nutrients for Cannabis

Last Updated: February 8, 2021
Roy Stevens
Product Review by Roy Stevens

There are lots of companies that create and manufacture nutrients for growing cannabis. But If you’re trying to figure out the best nutrients for cannabis, fortunately, there are plenty of fantastic products that utilize different formulas and techniques.

We’ve handpicked and reviewed five of the best nutrient brands on the market. But before we dive into the products, it’s important that you understand the nutrient numbers. The numbers appear in the order NPK, which stands for Nitrogen, Phosphorus, and Potassium.

If a bottle shows 6-4-4, 6 is the level of Nitrogen, 4 indicates the Phosphorus, and the last 4 indicates the Potassium.

The highest nutrient level is 15 and the lowest is 1.

Now that you understand the basics, keep scrolling to see our top 5 growing nutrients!

Our Reviews

Advanced Nutrients Bloom, Micro & Grow

Advanced Nutrients Bloom, Micro & Grow is a 3-part premium base nutrient formula that’s precisely formulated to provide your crops with the exact nutrient and concentrate ratios that they need.

When your buds are fed these formulas, they benefit from an array of amino acids, fulvic acids and powerful non-ionic surfactant which work together to form a multi-stage delivery matrix to ensure your plants absorb everything.

Advanced Nutrients Bloom, Micro & Grow’s balance-free ph perfect technology works around the clock to calibrate and adjust the ph, so you never have to use meters or add harsh ph-adjusting chemicals.

State-of-the-art carrier molecules ensure that your plants get the maximum amount of nutrients to their roots.


  • Plant root get the maximum amount of nutrients
  • Naturally calibrates the ph balance
  • Budget friendly
  • Suitable for beginners
  • Grows big buds


  • Some reviewers comment that the instructions are lacking details - you may need to use Google to answer any related queries.

Blue Planet Nutrients Elite High Yield Deluxe Kit Gallon

The Blue Planet Nutrients Elite High Yield Deluxe Kit Gallon provides all primary, secondary and micronutrients for growing cannabis.

This deluxe kit includes Elite Series Grow, Micro, Bloom, Easy Weed Soluble Seaweed, VitaBlue, Root Magic Mycorrhizae, Early Bloomer and Liquid Blue.

Easy Weed contains special naturally occurring growth hormones, over 60 trace elements, enzymes, amino acids, and carbohydrates.

The Vita Blue is a B-Vitamin supplement that allows the plant to focus its energy on root development, vegetative growth, flower development and the production of essential oils.

The Root Magic’s mycorrhizae form a symbiotic relationship with plant roots by increasing the absorbing area of roots by up to 1,000 times.

Early Bloomer is designed to maximize the early development of buds by providing plants with a 2:1 ratio of elemental potassium to elemental phosphorus.

When used together, all of the products make for a well-rounded feeding process for use in soil and all soilless growing mediums.


  • High-grade ultra-concentrated formula
  • Well-rounded feeding routine for plant nutrition of all life stages
  • Complete kit that’s suitable for beginners and experts
  • Suitable for all hydroponic systems and in soil
  • Provides all primary, secondary and micronutrients for the fruiting and flowering of plants


  • Not budget friendly

Humboldts Secret Starter Kit Pack

The Humboldts Secret Starter Kit Pack includes the essentials and additives you need to successfully grow healthy cannabis. This kit will make between 125-150 gallons of nutrient solution.

Humboldts Secret Grow & Bloom contains their signature blend of Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Fulvic Acid and more. This combination results in a complete feed that results in rapidly growing plants.

This two-part system should be used from the beginning of vegetative growth, right through to the end of the cycle.

Golden Tree is an All-In-One Additive that simplifies the number of products that you need while increasing your crops’ yield and quality. Golden Tree activates enzymes involved in plant growth and helps increase the rate of photosynthesis.

The Flower Stacker results in vigorous growth thanks to the Phosphorus and Potassium that increase early flowering and density.

The plant enzymes break down dead and decaying root matter which also helps to kill off potential diseases and infection that could destroy the plant.

The CalMag & Iron contains an exact balance of calcium, magnesium, and iron to address any deficiencies that could be encountered.


  • Perfect kit for beginners
  • Plant enzyme formula breaks down dead and decaying root matter
  • The package has the solution mix instructions by week
  • Grows big and healthy buds
  • Reasonably priced considering the amount included in this starter kit


  • The Golden Tree scent is pungent, but it’s worth it.

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

Fox Farm’s FX14049 Liquid Nutrient Trio Soil Formula Big Bloom, Grow Big, Tiger Bloom is growing nutrients that are perfect for hydroponic gardeners of all skill and experience levels.

Fox Farm is a well known and respected brand amongst cannabis growers and gardeners alike. This convenient 3-pack of top-liquid fertilizer is easy to use in sequence all season!

Start off with the Grow Big for generous green growth, next use the Tiger Bloom when your buds start to grow. The Big Bloom is used throughout each growing cycle to nourish and heal the roots.

Fox Farm’s FX14049 Liquid Nutrient Trio Soil Formula: Big Bloom, Grow Big, Tiger Bloom is best used in sequence for luscious fruit and brilliant buds all season long!

These products provide excellent nutrients for flowering cannabis. If you want big buds and high THC content, use as directed!


  • Great for mature and late season flowers
  • Produces big buds
  • High-phosphorus fertilizer
  • No strong odor
  • Fast-acting
  • Suitable for beginners


  • If you’re chemical conscious, it’s worth noting that not all three bottles are organic

General Hydroponics Flora Grow, Bloom, Micro Combo Fertilizer Set, 1 Quart

General Hydroponics Flora Grow, Bloom, Micro Combo Fertilizer Set, 1 Quart contains primary, secondary and micronutrients for enhanced yields and better crop quality.

This pack-of-3 allows users to adjust the mixtures to suit the needs of their crops. FloraBloom stimulates flower and fruit development while enhancing the aroma, flavor and essential oils in soil cultivated and hydroponic plants.

The General Hydroponics Flora Grow, Bloom, Micro Combo Fertilizer set formula contains highly purified concentrates for maximum solubility, superior formulation and reliability.

This formula is PH balances for ease of use and is the choice for NASA and Antarctic research scientists!

The Flora Grow, Bloom and Micro provide high phosphorous, potassium, magnesium and sulfur. The building blocks approach also provides nitrogen and calcium.


  • Mixture is adjustable
  • Builds strong roots
  • Contains highly purified concentrates
  • Suitable for beginners
  • Great value for money


  • Be careful, it’s easy to burn the plants if you don’t follow the instructions

What Should My Cannabis Nutrients Include?

There are few things to consider before you choose your growing nutrients.

The secret to choosing the right nutrients is understanding the requirements of your cannabis plants and having an awareness of how they absorb and utilize nutrients.

Once you have this knowledge, you can make a decision about which nutrients to buy without wasting your money and damaging your plants

What Are The Best Nutrients for Cannabis Grown In Soil?

Soil differs from hydroponic soilless blends because it contains organic matter such as compost, manure, humus, and worm castings.

Organic matter contains a lot of micro and macronutrients which need to be processed by microbes and fungi that live in the soil in order to be useful to your cannabis plant.

Organic nutrients and fertilizers contain fewer nutrients that are soluble with the elements that have benefits for organisms naturally in the soil. Therefore, If you want to grow your plants in soil, you should use organic nutrients and fertilizers.

Organic fertilizers have plenty of marijuana growing nutrients such as nitrogen, phosphorus, potassium, sulfur, magnesium, and calcium. Some of the blends that we reviewed contain the ideal mix of nutrients for your convenience.

What’s The Difference In Growing Cannabis using Hydroponics?

If you choose to use hydroponics to grow your cannabis, you will need specific nutrients because you won’t be using soil.

Most nutrients that are sold for growing marijuana plants are those for hydroponic techniques. They’re made using concentrated mineral salt and are often available in liquids but can also be sold in powder form.

There are two types of hydroponic growing;

  • Bloom solutions have high phosphorus level to encourage flower development
  • Grow solution has a high nitrogen level to aid vegetative growth.

Adding too many nutrients can damage or even kill your plants, so it’s important that you take care during the application. It’s useful to be cautious and only apply 25% of the recommended amount, working up gradually to full strength.


Cannabis plants require the following micronutrients;

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

Your plants will only need a small amount of these elements, however, they’re beneficial to the plant’s overall health and growth.

How Can I Achieve Healthy Cannabis Plants?

Cannabis plants need macronutrients that come from water, air, and some from the soil.

Oxygen, Hydrogen, and Carbon come from the water and air. Phosphorus, Nitrogen, Potassium, Calcium, Magnesium, and Sulfur come from the soil.

As we mentioned in the introduction, when you purchase fertilizer, you’ll find three numbers on the packaging. These numbers show the levels of nitrogen, phosphorus, and potassium in the mixture.

Cannabis Plants And Feeding Problems

You should be cautious when you’re growing cannabis because too many nutrients could damage your plants. If you’re in any doubt, only add nutrients to the water every alternate watering.

If your plant is experiencing a feeding problem, you’ll notice changes in your plant’s color or appearance. Imbalances are identifiable by irregular shapes, dimensions, yellowing or drooping leaves, brown spots, and burnt edges.

If your feeding problems persist, flush pure water through the soil for several days before resuming with half doses of the nutrient mix.

It’s normal to be cautious when you’re growing cannabis plants for the first time. If you follow our tips and tricks, your plants should be healthy and meet your expectations!


We hope we’ve provided you with all you need-to-know to pick the right growing nutrients for your cannabis grow!

Out of the 5 growing nutrients we’ve featured today, we chose the Blue Planet Nutrients Elite High Yield Deluxe Kit Gallon as the best nutrients for cannabis.

It can be used in every kind of hydroponic system from aeroponics, coco-coir, all soil-less mediums such as vermiculite, perlite, and also in soil.

Yes, the Blue Planet Nutrients Elite High Yield Deluxe Kit Gallon is expensive, but with something this important, would you really be happy knowing you’ve opted for an inferior product?

Did we include your favorite growing nutrients?

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