The flower stage is the phase of a cannabis plant’s life cycle when it stops focusing on vegetative growth and begins producing buds. During this stage, the plant develops flowers rich in cannabinoids and terpenes.
When the Flower Stage Begins
The start of the flower stage depends on the type of cannabis plant:
- Autoflower plants enter flower automatically based on age
- Photoperiod plants enter flower when light exposure is reduced, typically to a 12/12 light cycle
Once flowering begins, the plant shifts its energy from leaf and stem growth to bud development.
What Happens During the Flower Stage
During the flower stage, cannabis plants:
- Form pistils and bud sites
- Increase resin and trichome production
- Develop terpene profiles
- Slow vertical growth over time
- Require different nutrient ratios than in vegetative growth
This stage is critical for determining final yield, potency, and aroma.
Length of the Flower Stage
The flower stage typically lasts:
- 6–10 weeks for most autoflower strains
- 8–12 weeks for most photoperiod strains
Exact timing varies based on genetics, environment, and grow style.
Nutrient Needs During Flowering
Plants in the flower stage generally require:
- Reduced nitrogen compared to veg
- Increased phosphorus and potassium
- Consistent calcium and magnesium
- Stable watering practices
Overfeeding or underfeeding during this stage can directly impact bud quality.
Environmental Considerations
Key environmental factors during flowering include:
- Stable temperature and humidity
- Proper airflow to prevent mold
- Light intensity appropriate for canopy size
- Avoiding light stress or interruptions
Poor environmental control during flower can lead to reduced yields or plant health issues.
Why the Flower Stage Matters
The flower stage determines:
- Bud size and density
- Resin production
- Flavor and aroma
- Overall harvest quality
Mistakes made during this stage are difficult to correct later.