No — not all of them. Fan leaves are crucial for photosynthesis and overall plant health. However, selective defoliation can improve light penetration and airflow.
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What You Should Do in Week 4 of Flower:
1. Remove:
Large fan leaves that are blocking bud sites.
Leaves that are shaded and yellowing (they’re not helping anymore).
Inner growth that won’t reach the light (popcorn buds, weak stems).
2. Leave:
Healthy fan leaves that are exposed to light and helping fuel bud growth.
Any leaves that are not in the way and still look vigorous.
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Why It Matters:
In week 4, plants are deep into bud formation and will soon stop focusing on new growth.
Over-defoliation can stress the plant, slow growth, or even stunt bud development.
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Best Practices:
Trim over a few days rather than all at once (to reduce stress).
Focus on the top 2–3 nodes per branch for airflow and light.
Watch how the plant responds — a healthy plant will perk up within 24–48 hours.