All-natural fertilizer alternatives that are perfect for growing marijuana

Published Sep 7, 2019 09:00 a.m. ET
iStock / Zbynek Pospisil

Whether you are just learning how to grow marijuana or have the experience but little knowledge on more natural options, chemical-free fertilizers are an excellent choice as they do not impact the smell, taste or growth of your marijuana plant in any negative way. Though you might not see master growers or licensed producers using these methods to feed their growing marijuana crops, they have the experience, knowledge and tools necessary to use higher strength fertilizers without causing damage.

Even with proper instruction, manufactured options can significantly impact flavor and leave behind residues that can be damaging to your health, as they cannot be removed with curing. If all-natural options sound like they might be for you, then you will want to check out these 5 fertilizer alternatives for organic cannabis.

1. Worm Castings

If you cringe at the idea of worm castings, then you are not alone but do not worry, as they generally create no harm in the making of this product. Worm castings are little more than a fancy term for worm poo, as it is the digested materials that come out of the worm after they have ingested. This additive is full of nutrients and microorganisms that will work hard to keep your marijuana plant healthy and thriving, but it isn’t a great option for already established plants. Instead, it is most often used as a soil amendment long before planting.

2. Guano

This is the perfect addition, particularly for those who start out with a less nutrient-dense soil, as these droppings are chocked full of natural salts, nitrogen and phosphorus. All of which can be activated at each watering for a slow release of goodness for your growing marijuana plant throughout its entire life.

  • Bat Guano
  • Fossilized seabird Guano
  • Seabird Guano
  • Belize Bat Guano

3. Urine

Though it might sound a bit gross, it is never a good idea to pee directly onto your growing marijuana plant as it can burn the leaves and stems, however it does make an excellent addition to water in minimal amounts. This alone can help to boost your weed plants leaves and stem growth by a noticeable amount, just be careful not to overdo it. If you do decide to mix some urine fertilizer solution, be sure to use it all immediately as leaving a combination of ingredients like water and urine to sit can cause the ammonia levels to skyrocket, which will damage a plant rather than help to feed it.

4. Bone Meal

This is an excellent option for boosting nitrogen levels in your soil, however, this one isn’t a vegan-friendly option as these natural fertilizers are created using animal byproducts. They are perfect for adding to an already established plant because they will not harm the stem, they do not smell and will not attract hoards of annoying and damaging pests.

  • Soy Meal
  • Blood Meal
  • Steamed Bone Meal
  • Fish Meal

5. Tea Compost

This little-known secret is excellent for growing marijuana, and it isn’t just plain old tea grounds sprinkled onto soil. Tea compost is a combination of many different natural ingredients that are mixed together in a compost and then bathed in a hot liquid tea to activate the rich source of nutrients. Once this process is complete, you can use the soil by planting a marijuana plant directly in it, or by adding a nice thick layer of topsoil to your pots or garden. As you add water through regular care, it will slowly deliver a potent stream of needed nutrients to your cannabis plant.


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