Best Nutrients for Cannabis 2021

Best Nutrients for Growing Weed

Using the best nutrients for cannabis is crucial when growing cannabis at home. It’s really easy and can save you money and ensures you are getting the best quality cannabis. I’d recommend you use LED Grow Lights and grow tents to regulate your growing environment to get the highest quality cannabis.

Its easier to grow in soil for beginners while hydroponically gives you the most control.  Either way, you will need to provide the correct nutrients for the stage of growth. Cannabis nutrients comes in different variations depending on your growing medium.

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As Canada announces that growing marijuana at home for recreational users will be legalized as of July 2018 and many States have already allowed growing of marijuana for medical and recreational purposes, the time has come for growing cannabis at home. 

Over the last couple of years I’ve tried many different brands of nutrients and found these to be the best nutrients for cannabis.


Here are my top 5 picks for the best nutrients for growing cannabis in 2021.

1. Advanced Nutrients Bloom, Micro & Grow

Advanced Nutrients Bloom, Micro & Grow, Pack of 3, 1 L Each

best nutrients for cannabis

  • Using 3-Part formulas specifically designed for their high-value plants…
  • Using formulas with the absolute best and most potent nutrients and ratios…
  • Using the most advanced, state-of-the-art “carrier molecules” to ensure their plants get the maximum amount of nutrients in the least amount of time…
  • Using the formulas which have been proven, in multiple scientific studies, to get more color, more aroma, more size, and more potency from our plants…
  • And using formulas which are not only highly advanced and easily customizable, but easy to mix and use…

Advanced Nutrients has developed and refined the ultimate 3-part nutrients formula. The Advanced Nutrients Bloom, Micro & Grow combo pack gives you everything you need to provide your plants with the optimal nutrients for each stage of growth.

If you want to achieve the fastest growth and higher yields per watt, choose Advanced Nutrients Bloom, Micro & Grow combo pack.

  • Promotes healthy plants and fastest growth possible
  • Pharmaceutical grade precursors
  • More chelates per micronutrient than other manufacturers
  • Nutrient absorption from a broader pH spectrum
  • Concentrated, less-expensive formula
  • Easy to use

Simple Feed Chart Designed by our Research Team

 Week 1Week 2Week 3Week 4Week 5Week 6Week 7
Grow (Grow Phase)4 mL/L4 mL/L4 mL/L4 mL/L4 mL/L4 mL/L4 mL/L
Micro (Grow Phase)4 mL/L4 mL/L4 mL/L4 mL/L4 mL/L4 mL/L4 mL/L
Bloom (Bloom Phase)4 mL/L4 mL/L4 mL/L4 mL/L4 mL/L4 mL/L4 mL/L

Conversions: 1 Teaspoon = 5mL  |  1 Tablespoon = 15 mL  |  1 Ounce = 30mL  |  1 Cup = 240 mL

pH Perfect Technology

Advanced Nutrients Bloom, Micro & Grow has been developed to maintain the optimal pH level for your plants as long as your water has a pH level of 4.5 to 8.5. No need to check your pH level daily and making constant changes. Which means you’ll never have to manually adjust your pH level. The formulas used take care of the crop from top to bottom, promoting huge root systems, thicker stems, bigger leaves and the hugest blooms.


Advanced Nutrients Bloom, Micro & Grow  was specifically developed for growing cannabis. Unlike other brands that are general nutrients, this brand was created by a commercial cannabis grower. For an added boost you can add Advanced Nutrients Bud Candy or Big Buds during the flowering stage to get even better results.

All Advanced Nutrients products are backed by an unprecedented 100% guarantee. The guarantee means growers can buy and use the products with the assurance that you are getting the best for your precious crops.

2. Fox Farm FX14049 Liquid Nutrient: Big Bloom, Grow Big, Tiger Bloom

Fox Farm Liquid Nutrient Trio Soil Formula: Big Bloom, Grow Big, Tiger Bloom (Pack of 3 – 32 oz. bottles) 1 Quart Each

best nutrients for growing cannabis

  • A three-pack of favorite liquid fertilizers from FoxFarm
  • GROW BIG: produces lush, vegetative, compact growth
  • TIGER BLOOM: is an ultra-potent, fast-acting, high-phosphorus fertilizer
  • BIG BLOOM: Plant Food concentrate is ideal for all flowering and fruiting plants
  • Comes with: 1 Gallon Big Bloom, 1 Gallon Tiger Bloom, 1 Gallon Grow Big

Fox Farms has developed a three part liquid nutrients formula for soil and hydroponics. Fox Farm FX14049 Liquid Nutrient: Big Bloom, Grow Big & Tiger Bloom are the right nutrients tailored to your growing medium. 

Start with Grow Big for lush green growth. Switch over to Tiger Bloom during your flowering stage to enhance bud growth. Big Bloom can be used throughout all stages to build a well developed root system, the foundation to every plant.

  • Developed for soil and hydroponic systems
  • Concentrated forumla
  • Easy to use

Grow Big

Grow Big is fast-acting, water-soluble fertilizer for lush, vegetative, compact growth that can be used during all stages.

Tiger Bloom

Tiger Bloom is ultra-potent, fast-acting, high-phosphorus fertilizer with just enough nitrogen to sustain healthy, vigorous green growth during flowering.

Big Bloom

Big Bloom is micro-brewed formula incorporates earthworm castings, bat guano and other high test organic ingredients that offer a full range of nutrients. Norwegian kelp improves nutrient uptake and increases yields. Rock phosphate helps transfer energy from one part of the plant to another, which means bigger buds and more fragrant flowers.

Put it all together! Our customers asked for a three-pack of their favorite liquid fertilizers, and here it is: Big Bloom®, Grow Big®, and Tiger Bloom®, together at last.  Designed to work together to support vigorous growth, multiple bud development and abundant fruit.

Gardening Tip: For best results refer to the FoxFarm Feeding Schedule. And to give your plants the very best they deserve, don’t forget our Happy Frog® Potting Soil and Happy Frog® Soil Conditioner with beneficial microbes, earthworm castings, and bat guano.

Bring Your Plants To Life!®


Fox Farm FX14049 Liquid Nutrient: Big Bloom, Grow Big & Tiger Bloom is an excellent 3-part nutrient kit for both soil and hydroponic growers. Fox Farm nutrients can be found at your local shop. My personal choice is Advanced Nutrients as I’ve gotten the best results from them. 

3. General Hydroponics General Organics – Go Box

General Hydroponics GH5100 General Organics Go Box

best cannabis nutrients

  • General Organics Provides Gardeners With A Complete Line Of Premium Biological Plant Foods And Supplements
  • We Combine The Time-Tested Ingredients Of Traditional Agriculture With Sustainable And Efficient Methods Of Modern Cultivation
  • General Organics Now Has The Go Box Starter Kit

General Hydroponics General Organics Go Box is a complete hydroponic nutrient system that included everything you will need to grow the most potent weed from start to finish. These formulas were specifically developed for cannabis.

See Also:Hydroponic Systems for growing Cannabis

Each Go Box comes with 2 pint bottles of BioThrive Grow and Bloom plus 6 8-ounce samples of each Go liquid nutrient like CaMg+, BioWeed, BioBud, BioMarine, and Diamond Black. Below is a chart that outlines when and what nutrient you should be using during each stage of growth.


The General Hydroponics General Organics Go Box is a good starter kit that includes everything you will need to grow cannabis. When I first started growing I used General Hydroponics as this was the only nutrient available at my local shop. It does a good job and is consistent but I prefer Advance Nutrients as they are specifically designed for cannabis.

4. Advanced Nutrients Bud Candy Fertilizer

Advanced Nutrients Bud Candy Fertilizer, 1 Liter

Advanced Nutrients 2320-14 Bud Candy Fertilizer, 1 Liter, Brown/A

  • Bud Candy is 100% organic so it fits perfectly with an organic program. It also powers your flowers when you are using synthetic nutrients.
  • Bud Candy is a root zone formula that enhances roots and is quickly absorbed through them to create bigger, sweeter flowers. It’s not designed as a foliar spray.
  • Bud Candy contains the powerful sugars that will maximize bud growth

Advanced Nutrients Bud Candy Fertilizer protects your seedling or clones during the first stage of growth. It can also be combined with other nutrients during the 6 weeks of flowering for higher potency and yields. Bud Candy enhances the flavour and aroma of your cannabis.

Advanced Nutrients Bud Candy Fertilizer provides the correct blend of carbohydrates for sweeter and much tastier buds. Some growers use molasses during the flowering stage but I find that Bud Candy is much better. Using Big Bud and Bud Candy together creates the ultimate flavour and highest potent cannabis. 

Sweeter and the biggest buds with sticky resin filled glands are a result. I find the taste and aroma to be incredible by just adding Bud Candy during the first 6 weeks of flowering.

  • Finer taste and aroma
  • Increased Potency
  • Easy to use


For the ultimate buds, I recommend you add both Bud Candy & Big Buds during the flowering stage. They also have a line of organic nutrients for the health minded grower.

5. Advanced Nutrients Big Bud Fertilizer

Advanced Nutrients Big Bud Liquid Fertilizer

Advanced Nutrients Big Bud Liquid Fertilizer, 1-Liter

  • Make Your Flowers Bigger By Helping Your Plants Breathe, Metabolize And Produce. 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.

Advanced Nutrients Big Bug Fertilizer can be used in combination with your other nutrients during the flowering stage.  Developed to be added from the second week to the forth week of flowering. Big Bud provides all the essential micro-nutrients and 22 amino acids and are known to increase both the size and quality of your crop.

Start using Big Bud during the the second week of the flowering stage. You should see huge improvement in the size of your buds as they begin to swell. I really like using this in conjunction with Bud Candy. I saw an increase of nearly 20% in yields from my previous crop.

The Advanced Nutrients Big Bug Fertilizer contains potassium, amino acids and phosphorous to give you highest yields.

  • Larger, Heavier, denser buds
  • Buds with more essential oils, aromatics, terpenoids, phenols and other potency factors
  • Measurable, significant increases in overall harvest weight
  • Easy to use


Big Bud comes in a liquid and is easy to add to your existing nutrients. 92% of all growers use Advanced Nutrients Big Bud Fertilizer during the flowering stage. This should tell you something.

Conclusion – Best Nutrients for Cannabis

Both General Hydroponics and Fox Farms provide quality nutrients for both soil and hydroponic growing. I’ve tried both brands in the past but find Advanced Nutrients to be the best for growing cannabis. I’d recommend you give them a try and see for yourself. My pick for the best nutrients for cannabis review, it’s a no brainer, Advance Nutrients is the winner.

Identifying Nutrient Deficiencies

Nitrogen (N)

Nitrogen is required for all stages of growth but need more during the vegetative stage of growth. It is used in plant cells for the building blocks enzymes, protein and the green chlorophyll pigment. Chlorophyll is critical for plant growth, converting sunlight into energy in the form of carbohydrates and sugars.

Nitrogen Deficiency Signs

  • Stunted Growth, slower than expected
  • Yellowing of leaves, older leaves affected first
  • Purplish tints on the stems and underside of leaves

Phosphorus (P)

Phosphorus is important in energy transfer and storage in the plant. Without Phosphorus your plant will not be able to use the Nitrogen provided.

Phosphorus Deficiency Signs

  • Slow or stunted growth
  • Smaller leaves with blotchy spots
  • Reddish or purple leaf stems
  • Older leaves turn dark colours and curl downwards

Potassium (K)

Potassium is required for water uptake, flowering and cell wall development. Potassium keeps the sap stream and water flowing freely throughout the plant. It also helps plant resist environmental stresses, diseases and insects.

Potassium Deficiency Signs

  • Older leaves turning dull, yellowing and eventually developing rust coloured spots
  • Weak and brittle stems
  • Leaf edges look burnt, curled up leaves

Sulfur (S)

Sulfur aids in the production of essential amino acids, proteins and vitamins for chlorophyll production. It also plays a role in plant resistance of environmental stresses, diseases and pests.

Sulfur Deficiency Signs

  • Yellowing of all leaves
  • Buds dying off
  • Stiff and brittle leaves before falling off

Calcium (Ca)

Calcium builds strong cell walls and healthy root systems. Using too much Potassium can cause a deficiency in calcium, particularly if your soil has a low pH.

Calcium Deficiency Signs

  • Mottling or spotting of the leaf surface
  • Crinkling of leaves, curled tips
  • Stunted growth and smaller or deformed new leaves

Magnesium (Mg)

Magnesium is needed to move phosphorus around the plant and is important component in chlorophyll.

Magnesium Deficiency Signs

  • Yellowish or light green colouring of the veins and edges of older leaves
  • Brittle leaves

Trace Nutrients

These are required in trace amounts. Should be considered when selecting nutrients for growing cannabis.

  • Molybdenum (Mo): Involved in nitrogen metabolism
  • Copper (Cu): Needed to produce chlorophyll and for plant respiration
  • Zinc (Zn): Associated with chlorophyll production and protein synthesis
  • Manganese (Mn): Involved in growth, germination and new tissue production
  • Iron (Fe): Helps carry oxygen around plant cells and involved in chlorophyll production
  • Boron (B): Moves sugars around the plant and is involved in the uptake of calcium

The important thing to remember with all these nutrients is that they work together.

Often over or under feeding of a particular nutrient will cause the plant to block other nutrients from being uptake.  A well balanced nutrient developed for growing cannabis will ensure you get the most out of your indoor marijuana garden.

The best nutrients for cannabis is a personal choice amongst growers. You will find every grower has a personal favourite. I hope I’ve been able to help you with your choice.

See Also:pH Pen User Guide

best nutrients for cannabis


Hey I'm Dennis, Thanks for stopping by. I'm a Horticultural Expert in growing marijuana indoors and hydroponics. I will be sharing my expertise in growing marijuana with LED Grow lights.

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