Winter Lemon Tree Leaf Drop: Underwatering in Bloom

Why Now?

Blooming increases water demand dramatically. Indoor winter conditions (low humidity, heated air) accelerate transpiration. If watering hasn't increased, the tree aborts leaves to save flowers/fruit.

Immediate Adjustments

1. Increase watering: Check daily. Water when top 1 inch dry (not on a schedule).
2. Empty saucer at 15 min: Prevents root rot.
3. Slow-release fertilizer: Osmocote or Nutricote (citrus formula). Avoid liquids—they spike salts, requiring more water.
4. Repot if root-bound: Roots circling = can't absorb water even if available.
5. SaturAid (wetting agent): Helps hydrophobic peat mixes rewet evenly.

Outdoor Time

When >40°F, place outside for humidity and light. Acclimate gradually.

Leaf drop during bloom = "I'm making fruit and running out of water." Increase supply, and it stabilizes.