The 6 Stages of Cannabis Growth
Understanding each stage is essential for providing the right environment, nutrients, and care at the right time.
The seed cracks open and a taproot emerges. Keep seeds moist and warm (70–85°F) in darkness.
Key Tips:
- Use the paper towel method or plant directly in starter cubes
- Maintain 70–85°F temperature
- Keep humidity at 70–90%
- Avoid direct light until seedling emerges
First true leaves (fan leaves) develop. The plant establishes its root system and begins photosynthesis.
Key Tips:
- Provide 18 hours of light per day
- Keep humidity at 60–70%
- Water sparingly — overwatering is the #1 mistake
- Use small containers (1–2 gallon)
Rapid growth phase. The plant builds its structure, branches, and leaf mass before flowering.
High nitrogen (N-P-K: 3-1-2)
Key Tips:
- Maintain 18/6 light schedule for indoor grows
- Train plants with LST, topping, or FIMing
- Increase nitrogen-heavy nutrients
- Transplant to larger containers as needed
- Keep humidity at 40–70%
The plant shows its sex. Males develop pollen sacs; females show white pistils. Remove males immediately.
Key Tips:
- Switch to 12/12 light cycle for indoor grows
- Identify and remove male plants
- Begin transitioning to bloom nutrients
- Reduce nitrogen, increase phosphorus
Buds develop and swell. Trichomes form and mature. This is the most critical phase for potency and yield.
Key Tips:
- Maintain 12/12 light cycle strictly
- Keep humidity below 50% to prevent mold
- Use high-phosphorus, high-potassium nutrients
- Flush with plain water 1–2 weeks before harvest
- Monitor trichomes with a jeweler's loupe
Trichomes are milky/amber, pistils are 70–90% orange/red. Cut, trim, and begin drying.
Key Tips:
- Harvest when 70–90% of pistils are amber/red
- Milky trichomes = peak THC; amber = more CBN/relaxing
- Harvest in the dark or early morning for best terpenes
- Wet trim or dry trim based on preference