Vegetative Week 3
Week-three vegetative cannabis plants developing branches and canopy: assess plant vigor, lighting, watering and readiness for the next growth stage.
VEGETATIVE WEEK 3 / FIELD NOTES
Build structure before the flowering transition
By the third vegetative week, a vigorous plant may show stronger lateral branching and more leaf area. The useful decisions are about canopy shape, stable uptake and actual plant readiness—not the calendar number alone.
- 01Canopy
Look for even light reaching healthy leaves.
- 02Structure
Follow branching and spacing between nodes.
- 03Uptake
Match watering and feeding to growing demand.
- 04Transition
Judge health and plant size before flowering.
IN THIS GROW
The plants in this grow
The rooted clones grew in buckets under continuous metal-halide lighting. By this point, stronger branching and an expanding canopy provide useful clues about how the plants are progressing.
GROW JOURNAL
By vegetative week 3, these clones were nearly ready for the flowering stage. They rooted in less than a week before moving into grow buckets on tray tables under metal-halide lights operating 24 hours a day. The 18-hour light and 6-hour dark schedule in the grow-stage reference below is a commonly used vegetative alternative.
Read node spacing and branching
Healthy vegetative growth produces more leaves, branches and supporting stem. Watch whether internodes stay reasonably compact for the cultivar and lighting, and whether lower growth is becoming shaded. Long, thin stretches can reflect inadequate light at the canopy, while distorted or pale top growth can indicate excessive light, heat or other stress.
Keep the canopy uniform
Rather than assuming every plant will reach flowering readiness in three weeks, inspect its height, branch spread and the space available. Rotate or space containers where appropriate to improve access to light and airflow. If you choose to prune or train, factor in the plant’s health and recovery time before changing the flowering schedule.
Water, nutrients and root-zone stability
Growing leaf area can increase water and nutrient demand, but feeding should follow the medium and actual plant response. Check root-zone moisture, drainage, solution measurements where relevant and signs of buildup or stress. The FoxFarm chart further down is a reference for its own soil-feeding program—not a universal target for every hydroponic or soil setup.
View this week's feeding referenceVegetative week 3
A field-friendly reference that pairs this stage with the current FoxFarm soil schedule. Scale the recipe to your actual watering volume with the calculator instead of doing the math in the grow room.
Schedule values are a reference to the current FoxFarm soil chart, not a universal prescription for every cultivar, medium or environment.
OBSERVATION CHECKLIST
Four observations worth making this week
Branching
New shoots and lateral branches are developing without damage to the growing tips.
Leaf condition
Look for broadly consistent color and turgor, without persistent spotting, curling or rapid yellowing.
Air movement
Increasing foliage should not create a stagnant, crowded interior.
Root-zone trend
Check changes in water use and root-zone readings before adjusting nutrition.
NEXT STAGE
Is the plant ready to approach flowering?
Use plant condition and your growing system as the guide rather than treating a week number as a deadline.
- The plant is vigorous, without a current pest or root-zone problem.
- Canopy size and anticipated stretch fit the available vertical space.
- Watering, airflow and lighting can support a larger plant.
- For photoperiod types, the planned light-cycle change matches cultivar and grow objectives.
Growing references: University of Saskatchewan — Vegetative Growth and Indoor Lighting.