Natural Fertilisers for Cannabis
Growing high-quality cannabis requires an abundance of nutrients in the form of fertilizers. The three essential macronutrients that cannabis needs are Nitrogen (N), Phosphorus (P), and Potassium (K). In addition, cannabis requires other nutrients in smaller quantities, including Magnesium, Copper, and Iron, as well as various micronutrients that are essential in even smaller amounts.
The nutritional needs of cannabis change depending on its growth stage. During the vegetative stage, cannabis requires more Nitrogen, while in the flowering stage, the demand shifts to higher levels of Phosphorus and Potassium.
Natural fertilizing solutions serve as an effective way to provide your plants with the nutrients they need at the right time. Many primary and secondary nutrients can be sourced from various organic materials.
Sources of Nutrients:
Nitrogen: Bat guano, worm castings, and chicken manure.
Phosphorus: Bone meal, fish meal, banana peels, and rock dust.
Potassium: Kelp, fish meal, and wood ash.
Magnesium: Epsom salts and dolomite.
Calcium: Clay, gypsum, and limestone.
Natural Fertilizers:
- Bat Guano: A natural fertilizer rich in Nitrogen and other essential nutrients. It is sourced from nitrogen-rich ammonia and is abundant along the eastern coasts of the Pacific and South America, as well as in Indonesia and Madagascar. Bat guano supports cannabis growth, encourages healthy root and stem development, and contributes to flowering. It can be used as a crop supplement, soil conditioner, fungicide, and compost activator, helping improve soil quality and the taste of the buds.
- Worm Castings: These are the nutrient-rich leftovers from earthworms that digest soil and organic matter. They introduce beneficial microorganisms into the soil and can be effectively utilized in compost tea. Directly applying worm castings can negatively impact the taste of the cannabis, so it's best to use them in liquid form.
- Chicken Manure: This manure is high in Nitrogen and contains fair amounts of Potassium and Phosphorus. Sourced from chicken coops, it requires proper composting to reduce the potency of its nutrients; otherwise, it can harm your plants if applied raw.
- Bone and Fish Meals: For nitrogen-rich nourishment, bones and inedible fish parts can be ground into a fine powder and mixed with fish emulsion or oil. Blood, bone, and soybean meal can also be used as alternatives.
- Wood Ash: This provides an additional source of Potassium for cannabis plants. Lightly scattering wood ash on plants or incorporating it into compost can be beneficial. Ash from hardwood trees, such as oak and maple, contains more nutrients than that from softer woods and can also act as a pest deterrent.
- Epsom Salts: Epsom salts, or magnesium sulfate, are an excellent natural source for boosting magnesium and sulfur levels in cannabis plants with minimal risk of overfeeding. They are readily available at gardening stores.
- Dolomite Limestone: This mineral solution is ideal for supplying calcium to cannabis plants. It also effectively treats acidic soils.
- Kelp and Molasses: Kelp, found in shallow saltwater near coastal areas, serves as an excellent component in brewing liquid fertilizers such as compost tea. To enhance bacterial content, molasses or black treacle – a thick byproduct from sugarcane or sugar beet refining – can be added.
By understanding and utilizing these nutrients and natural fertilizers, you can cultivate healthier cannabis plants that thrive at every growth stage.
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Liz Filmer
