The Ripening Phase is the final stage of the cannabis lifecycle before harvest. During this phase, buds reach full maturity, trichomes ripen, and plants draw from stored nutrients. Ensuring precise environmental control and minimal stress is critical to achieve peak flavour, aroma, and potency.
| Parameter | Ideal range |
| Water pH (Soil) | 6.0–6.5 |
| Water pH (Coco Coir) | 5.7–6.2 |
| Water pH (Hydroponics) | 5.5–6.0 |
| EC Soil (mS/cm) | 0.8–1.0 |
| EC Coco Coir (mS/cm) | 1.0–1.2 |
| EC Hydroponics (mS/cm) | 1.2–1.4 |
| Day Temperature (°C/°F) | 22–24°C / 72–75°F |
| Night Temperature (°C/°F) | 18–20°C / 64–68°F |
| Root Zone Temperature (°C/°F) | 18–22°C / 64–72°F |
| Leaf Surface Temperature (°C/°F) | 22–24°C / 72–75°F |
| Related Humidity (RH%) | 30–45% |
| VPD (kPa) | 1.0–1.2 |
| Optimal CO₂ (ppm) | 400–600 |
| PAR (μmol/m²/s) | 600–900 |
| Lights Hrs/Day | 12/12 (Photoperiod) or unchanged for Autoflowers |
| Light Intensity (%) | 90–100 |
| Light Distance (cm/in) | 20–40 cm / 8–16 in |
| Substrate Moisture | Lightly moist, reducing toward flush |
| Primary Nutrients | P, K (medium) |
| Secondary Nutrients | Ca, Mg, S (medium) |
| Micronutrients | Fe, Zn, Mn, B, Cu, Mo |
| N-P-K | 0-5-6 |
| LST | n/a |
| HST | n/a |
| Medium | Frequency | Volume (ml/L) | Runoff % |
| Soil | Every 2–3 days | 300–400 | Minimal |
| Coco Coir | Daily | 350–450 | 10–15% |
| Hydroponics | Continuous | Maintain aeration | Ensure reservoir |
Nutrient intake during this phase focuses on utilizing stored resources rather than heavy feeding. Phosphorus and potassium support final resin production, while minimal nitrogen prevents harsh flavours.
| Milestones | ⬜ | Fully mature buds with desired trichome colour. |
| ⬜ | Strong aroma and sticky resin covering the buds. | |
| ⬜ | No visible signs of pests, mould, or nutrient issues. | |
| Checklist | ⬜ | Trichomes inspected for ripeness. |
| ⬜ | Nutrient levels reduced or flushing initiated. | |
| ⬜ | Plants structurally supported to prevent branch breakage. | |
| ⬜ | Environmental parameters maintained at optimal levels. |
The ripening phase is the final stage where buds mature, trichomes ripen, and the plant prepares for harvest.
Look for signs like swelling buds, darkened pistils, and trichomes transitioning from milky to amber.
Stick with a 12/12 schedule for photoperiod plants; autoflowers remain unchanged.
Minimise nutrients, focusing on potassium and phosphorus; reduce nitrogen to prevent harsh flavours.
Yes, flushing with pH-balanced water helps remove residual nutrients, improving the flavour and smoothness of the buds.
Check the colour of trichomes under magnification—milky indicates peak THC, while amber suggests a more relaxing effect.
Yes, most growth halts as plants focus on maturing buds and resin production.
Natural fading is the yellowing of leaves as the plant consumes stored nutrients; it’s normal during ripening.
Reduce watering in the last few days to promote proper drying and avoid excess moisture in the buds.
Yes, introducing UVB light can stimulate resin production, but use it cautiously to avoid plant stress.
Reduce watering frequency and volume gradually during ripening to prepare the plant for proper drying.
Leave fan leaves intact unless they obstruct airflow or light; they aid in nutrient redistribution.
Look for discoloured leaves, stunted buds, or irregular runoff EC readings; flush if necessary.
Milky trichomes with 20–30% amber, pistils darkened and curling, and strong aroma are good indicators.
Yes, overripe trichomes with too much amber may result in degraded THC and reduced psychoactive effects.
