The late vegetative stage of cannabis is the final growth phase before the plant transitions into flowering. It’s one of the most critical times for shaping, training, and preparing the plant for maximum yield and health. Here’s a detailed overview.

Timeline

Duration: Typically weeks 4–8 of the vegetative phase (depending on strain and grow conditions).

Transition point: Ends when the light cycle changes to 12 hours light / 12 hours dark, triggering flowering.

Plant Characteristics

Rapid vertical and lateral growth (can double in size weekly).

Thickening stems and branches.

Increasing number of fan leaves and nodes.

More vigorous root development.

Strong aroma may begin to develop.

Ideal Environmental Conditions

Nutrients

Focus on Nitrogen (N) for leaf and stem development.

Balanced Calcium (Ca) and Magnesium (Mg) for cell structure and photosynthesis.

Moderate Phosphorus (P) and Potassium (K) to prepare for flowering.

Common N-P-K ratio: 3-1-2 or 4-2-3.

Training & Maintenance

This stage is perfect for low-stress training (LST) and pruning to shape the canopy:

Topping / FIMing: To promote bushier growth and more colas.

LST (bending branches): Helps create an even canopy.

Defoliation: Remove large fan leaves that block light to lower bud sites.

Transplanting: If needed, do it before flowering starts.

Common Issues to Watch

When to Transition to Flowering

Plant has reached half of your desired final size (it will stretch 1.5–2× during flowering).

The canopy is even and strong.

Healthy root system and no nutrient deficiencies.