Organic cannabis cultivation offers growers a sustainable and high-quality alternative to synthetic methods. Within organic growing, there are two distinct approaches: using carbon-based nutrients that slowly decompose in the soil and relying on water-soluble organic nutrients in lighter, well-draining soil. Each method has unique benefits and challenges, catering to different cultivation styles and goals.
1. Organic Growing: The Core Principles
Organic cultivation emphasizes soil health, natural inputs, and a holistic approach to plant nutrition. Both carbon-based and water-soluble organic methods align with these principles but vary in execution and outcomes.
2. Method 1: Carbon-Based Nutrients in Heavy, Nutrient-Rich Soil
Overview
This method relies on amending the soil with organic matter that decomposes over time, releasing nutrients gradually. It’s about creating a self-sustaining, “living” soil environment.
Key Features
Nutrient Cycling: Carbon-rich materials like compost, biochar, and aged manure act as slow-release nutrient sources.
Microbial Interactions: A robust microbial community breaks down organic matter, feeding the plants.
Minimal Intervention: Once established, the soil requires less frequent nutrient applications.
Pros
Long-lasting fertility with fewer inputs over time.
Improved soil structure and water retention.
Enhanced flavor and quality of the cannabis due to natural nutrient uptake.
Cons
Heavier soil can limit drainage, increasing the risk of overwatering.
Plants may grow slower if the environment isn’t properly dialed in.
Example
Websites like BuildASoil provide everything you need to build a healthy, robust soil. A great option is their BuildASoil 3.0 potting soil, which has everything your plants need to thrive from vegetative growth to flowering. If deficiencies arise during flowering, you can add “Build-A-Flower,” a powerful amendment that is scratched into the top layer and watered in.
For those who prefer in-person shopping, local garden stores often carry soils like Fox Farms Ocean Forest. While it may not be as nutrient-dense as BuildASoil 3.0, it’s an excellent, budget-friendly option. To enhance Ocean Forest, consider adding worm castings and amendments from BuildASoil, ensuring your plants have everything they need. Two standout amendments are Craft Blend and Build-A-Flower.
Don’t forget about gypsum! High-quality gypsum, like Premium 97 Diamond K Gypsum, is a great source of calcium and sulfur, essential nutrients for healthy cannabis plants. Avoid lower-quality gypsum, as it may contain heavy metals that can harm your soil and plants.
The Role of Microbes
Microbes are essential for breaking down nutrients and making them readily available for your plants—a process known as nutrient cycling. Think of microbes as the gut flora of cannabis plants. Some standout microbial products include:
Photosynthesis Plus
Primordial Solutions
Fish Amino Acids (Fish AA)
Azos and Mykos (when used together)
For additional nutrition, Bio-Live is a nutrient-packed product that also provides beneficial bacteria and mycorrhizal fungi, stimulating root development and plant vigor. If you want a more cannabis-specific option, consider Greenhouse Feeding Bio Grow and Bio Flower, which are designed for cannabis plants and come with a good amount of mycelium.
3. Method 2: Water-Soluble Organic Nutrients in Light, Draining Soil Media
Overview
This approach uses lighter, well-draining soil media designed for frequent feeding with water-soluble organic nutrients. It allows growers to have more control over nutrient delivery.
Key Features
Active Nutrient Management: Nutrients are dissolved in water and applied directly to the roots.
Flexible Soil Media: Coco coir, peat moss blends, or perlite-based mixes optimize drainage and aeration.
Customizable Nutrition: Adjust nutrient concentrations based on plant growth stages.
Pros
Faster nutrient absorption for quicker growth responses.
Allows for precise control over feeding schedules.
Reduced risk of nutrient lockout in well-draining soil.
Cons
Requires more frequent feeding and monitoring.
Dependency on external nutrient applications.
Higher water usage compared to carbon-based systems.
Example
After trying both methods, I prefer water-soluble nutrients for the control they offer. Among organic water-soluble options, two standout companies are Organics Alive and Earthcraft Biosystems. Of these, I’ve used Earthcraft’s full lineup, and their ease of use and quality are unmatched.
Another company worth mentioning is Bokashi Earthworks. While I haven’t tried their products yet, they are highly regarded for producing some of the best organic nutrients in the industry.
4. Can You Combine Both Methods?
Yes! Many growers use a hybrid approach by starting with a carbon-rich base soil and supplementing with water-soluble organic nutrients during key growth phases, such as flowering. This strategy offers the best of both worlds: sustained fertility and targeted nutrition.
Example
Pair BuildASoil 3.0 soil with microbial products like Photosynthesis Plus or nutrients from GreenLife Biotics. Products like Brix57 are excellent for providing your plants with rich carbohydrates, resulting in high-brix cannabis flowers with superior resin and terpene production.
5. Conclusion: Finding Your Organic Growing Style
Both carbon-based and water-soluble organic methods showcase the versatility of organic cannabis cultivation. The choice depends on your growing goals, environment, and experience level. By understanding the strengths and limitations of each approach, you can cultivate cannabis that is not only high-quality but also aligned with sustainable practices.
