Best Organic Fertilizer for Healthy Weed

If you are in a hurry and just want to find out what the best organic fertilizer for weed is, then we recommend Dr. Earth Organic 5 as the best one.

I usually do not like applying fertilizers on my plants. Sometimes, however, I have to give in and use them in order to provide the extra nutrients that my plants need. In such cases, I always go for organic fertilizers because they do not compromise the safety of my plants. Organic fertilizers promote the growth of healthy marijuana buds. The best part is that they rot back into the soil, thus adding to the organic matter!

With states continuously legalizing weed, there has been an increasing demand for weed fertilizers. This is why I am reviewing 5 top products to help you find the best organic fertilizer for cannabis. Before delving into the products, however, here is a buying guide to help you make an informed purchase.

Here are the marijuana organic fertilizers we’ll be reviewing:

Benefits of Organic Fertilizer for Weed

  • Increases soil nutrients for increased bud volume and health
  • Increases weed potency
  • It rots and breaks down into the soil to add organic matter to the soil structure
  • It reduces soil acidity and does not cause leaching

Things to Look For In the Best Organic Marijuana Fertilizer 

When looking to buy the best fertilizer for cannabis, there are a few factors you need to look at to ensure you get the best one for your plants. These are:

· Solubility

The best weed fertilizer should have water-soluble nutrients. It should be soluble in water in whatever form it is, whether liquid or solid since it needs to flow into the plant. The root systems are the best uptake for cannabis fertilizer and they easily absorb liquids.

· Organic components

Weed requires numerous elements. However, it depends on three critical ones. The key mineral components that are essential for weed are nitrogen, phosphorous, and potassium. Ensure that your fertilizer has NPK, which are the symbols for the three elements. Below is a brief of the importance of each element.

  • Nitrogen: Nitrogen is critical for the flowering process and photosynthesis. The process of photosynthesis converts carbon to sugar, generates chlorophyll, and promotes faster growth. Nitrogen is also obtained from manure and blood meal among others.
  • Phosphorous: Phosphorous is critical at the flowering stage because it provides the bud with volume, density, and good health.
  • Potassium: Potassium promotes bud bloom and strengthens the immunity of your plants.

· Additional nutrients

As mentioned above, there are numerous nutrients required when growing weed. Some trace minerals critical for growing marijuana include Chlorine, Boron, Zinc, Iron, Copper, and Manganese. These nutrients aid in crop growth and potency. The best pot fertilizers will have all of these essential micronutrients that are important for long term crop development.

Check out this video to learn more about NPK!

Best Way to Use Fertilizer for Weed

Before anything else, dissolve the weed fertilizer in water. Use the recommended measurements to avoid putting too much of it. Too much marijuana plant food is dangerous to your plants.

Next, spray large leaves with the fertilizer solution. Additionally, spray leaves that show signs of nutrient deficiency. After spraying, water the plant accordingly. Remember that too much water is not good for your crops.

Avoid using concentrated mixtures by only applying every 2 weeks until flowering. 2 weeks before harvest, flush all the fertilizer out of the soil using water. Moreover, you will need to remember that NPK fertilizers lower the soil pH, which means that you need to keep adding calcium as required.

Plant Magic Plant Food 100% Organic Fertilizer

Your marijuana plants will love this plant food fertilizer because it provides nutrients for all stages of plant growth. This is possible because it contains a wide array of micronutrient ingredients that your plants will need to grow. What’s more, it does not burn your plants at all.Thanks to its quick solubility in water, it can be used on several types of soils. The organic formulation makes it safe for use on your plant so you do not have to be part of the harmful fertilizer statistics. Fertilizers lead to healthy marijuana crops that do not require pesticides to thrive, something that saves you money.

If you are just starting to grow weed, this is a great option for you because the formulation contains most of the essential minerals that you need for your crops. As such, you do not have to worry about getting numerous products amid the minimal knowledge you have. The best part is that you have 30-days to test it to know if it is the right one for your crops. If not, you will get a full refund.


  • Provides nutrients for all stages of plant growth
  • Safe to use
  • The product comes with a 30-day money back guarantee as a promise of quality
  • Easy to use


  • Has a strong whiff

>> Check Price On Amazon<<

Dr. Earth Organic 5 Tomato, Vegetable and Herb 

I like the fact that this pot fertilizer is made from all natural ingredients, thus making it absolutely safe for use on your plants. It contains the highest primary plant nutrients levels to increase production for a range of crops in addition to your marijuana crops. Nutrients are released quickly to promote the development of larger healthier buds and accelerate plant growth.Another awesome thing about this fertilizer is that it contains 8 strains of endo and ecto Mycorrhizae that make your crops drought tolerant. This is a great feature when you need to produce plants at specific moisture contents.

It comes in 9 package sizes to allow you to choose the ideal size for you at your budget. It is packed generously and you can use it for a longer time. Moreover, the fertilizer does not contain GMO or chicken manure.


  • Accelerates growth
  • Easy to use
  • Packet contains a generous amount of fertilizer at such an affordable price
  • Safe formulation


  • The fertilizer mixture has a horrible smell

>> Check Price On Amazon<<

Unco Industries (WWSB15LB) Wiggle Worm Soil Builder

This multipurpose organic fertilizer provides nutrients in the soil that are beneficial to a wide range of crops in addition to your pot plants. Earthworms ingest the fertilizer material to produce rich humus to provide plant nutrients.This Unco organic fertilizer contains nutrients that keep your crops nourished even in the long term. It quickly dissolves in water for maximum uptake by the crop roots. What’s more, it improves the soil structure because it does not compact together. This allows the soil to aerate, a process that gives more access to water, air, and nutrients to the plant roots.

Unco has a money back guarantee to allow you to test if the product is the ideal one for you. I like that it does not smell like other organic fertilizers, and that it is very easy to use.


  • Contains optimal amounts of nutrients and trace elements
  • Has a non-toxic formulation that can be used even indoors
  • Multipurpose
  • Odorless
  • A little goes a long way


  • Users have reported seeing bugs after use

>> Check Price On Amazon<<

Espoma GT18 Garden Tone

If you have a few extra bucks to spare for a high-quality fertilizer, this should definitely be on your buying list. Espoma GT18 fertilizer contains natural organic ingredients that are long lasting and capable of breaking down to facilitate continuous feeding. The nutrients are used at different stages of plant growth, which means that this fertilizer will keep your plants continuously fed.It has few salts, which means that it cannot bun your plants. The natural formulation is safe to use on your weed plants and it breaks down to add organic matter into the soil. The fertilizer contains bio-tonne microbes that add nutrients to the soil.

The high price tag on this organic fertilizer is matched with awesome functionalities. For instance, Espoma GT18 accelerates the growth of your marijuana crops without altering their composition but adding to their potency. It also works within a very short time, which means that the results are almost instant.


  • Contains long lasting minerals
  • Has bio-tonne microbes that add nutrients to the soil
  • Safe organic formulation
  • Accelerates plant growth


  • Quite costly

>> Check Price On Amazon<<

The Andersons 7-1-2 Innova Organic Fertilizer

Thanks to its high amino acid and nitrogen release source percentages, this organic fertilizer is capable of improving the health of your weed plants. It promotes fast crop growth and the formation of healthy buds. The fertilizer works by providing highly-digestible carbon to feed soil microbes.This Innova fertilizer does not smell, which is a big plus for me. Some organic fertilizers can smell horribly, an attribute that can limit their use indoors. Not this one, fortunately. To add to the quality standards, the fertilizer is a USDA bio-preferred product and is OMRI listed. The natural nontoxic formulation makes it safe to use on your marijuana, and you do not have to worry about overusing it. This is because it does not contain animal parts or manures.


  • OMRI safety certified
  • Safe formulation
  • Low dust granules
  • Easy to apply
  • Made of on plant nutrients


  • Very expensive

>> Check Price On Amazon<<


I treat my cannabis plants with a lot of love as should you. You need to keep them looking healthy by only using the best organic fertilizer for marijuana. Organic fertilizers have natural formulations that are nontoxic and safe to use on your marijuana plants. The 5 reviewed products are great additions to your marijuana plant maintenance kit. However, hands down, Dr. Earth Organic 5 fertilizer is my top pick as the best organic fertilizer for weed.

This is because it has an all organic formulation that makes it safe for use on your plants. It also releases nutrients quickly for accelerated growth and development of healthier buds within a short time. Since it contains nutrients that are essential even in the long term, you can be sure that your plants are continuously feeding. The small shortcoming of the horrible smell can easily be countered by applying it in the daytime when people are not around the home.

I hope that my buying guide and reviews have brought you closer to finding the ideal fertilizer for your babies. You also know what to look for in a weed fertalizer, which means that you can now go forth and grow the best weed you can. Whether you are just starting out or you need to rejuvenate fallen weed plants, organic is the way to go.

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