Cannabis Flowering Stage Coco Coir Recipe
A comprehensive coco coir nutrient recipe for the cannabis flowering stage, engineered for dense, resinous flower production with precise PK ratios and a detailed weekly feeding schedule.
The flowering stage is where cannabis delivers its final product, and coco coir is the premier medium for maximizing flower density, trichome production, and terpene profiles. This recipe provides the exact nutrient ratios needed from the first day of 12/12 light through final flush, covering the stretch phase, early flower, bulk phase, and ripening. Coco coir offers a unique advantage: it behaves like a hydroponic medium with the forgiveness of soil. It holds moisture and nutrients while maintaining excellent air-to-water ratio at the root zone. However, coco has a natural cation exchange capacity that buffers calcium and magnesium — meaning you must supplement CalMag throughout the entire grow to prevent lockout. This recipe uses Canna Coco as the base nutrient, which is specifically formulated for coco coir and accounts for its unique chemistry. The PK boost schedule is carefully timed to match the plant's shifting demands: early flower needs continued nitrogen for stretch growth, mid-flower needs peak phosphorus and potassium for bud building, and late flower benefits from a gradual reduction followed by a final flush to improve flavor and smoothness.
Etapas Nutricionales (ppm)
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Preguntas Frecuentes
When should I add PK booster during cannabis flower in coco?
Begin PK 13/14 during week 4 of flower when buds are actively stacking and gaining weight. Continue through week 6, then discontinue. Starting PK too early wastes money and can cause nutrient burn. Starting too late misses the critical bud-building window. The plant's phosphorus and potassium demand peaks during weeks 4-6.
What EC level should cannabis be at during flowering in coco?
EC ranges from 1.2 mS/cm in early flower (weeks 1-2) up to 2.0-2.2 mS/cm during peak bloom (weeks 4-6), then tapers to 1.2-1.6 mS/cm during ripening (weeks 7-8), and finally 0.1-0.3 mS/cm during the flush. Always monitor runoff EC — if it's more than 0.5 mS/cm higher than input, flush with plain water to clear salt buildup.
How often should I water cannabis in coco coir during flower?
During peak flower, cannabis in coco should be fertigated (fed with nutrients) 3-5 times per day, with 15-20% runoff each time. Coco should never completely dry out — it should cycle between wet and moist. High-frequency fertigation in coco produces faster growth and bigger yields than once-daily watering. Use a timer and drip system for consistency.
Should I flush cannabis in coco before harvest?
Yes, flushing coco for 7-10 days before harvest is recommended. Coco holds nutrient salts that can affect flavor if not flushed. Water with plain pH-adjusted RO water (EC 0.1-0.3 mS/cm) and monitor runoff EC. Continue flushing until runoff EC drops below 0.5 mS/cm. Some growers use Flawless Finish or FloraKleen to accelerate the flush.
Why do I need CalMag in coco coir but not in other media?
Coco coir naturally holds calcium and magnesium cations on its fibers through cation exchange capacity (CEC). This means the coco 'steals' calcium and magnesium from your nutrient solution, making them unavailable to the plant. Pre-buffering with CalMag before planting, and supplementing CalMag with every feeding (2-3 ml/L), counteracts this effect. Without CalMag, you'll see brown spots (Ca deficiency) and interveinal chlorosis (Mg deficiency).