How to Grow Basil Indoors (and Keep It Alive)
Basil grows indoors with 6+ hours of light and temperatures above 60°F. It’s ready to harvest in 50–60 days. The main killers are cold and overwatering.
Basil is tropical. Treat it like a tropical plant and it thrives indoors.
Indoor Setup
| Factor | Requirement |
|---|---|
| Light | 6+ hours, south window or grow light |
| Temperature | 65-75°F |
| Pot | 8-inch minimum |
| Soil | Well-draining potting mix |
| Water | When top inch is dry |
Step-by-Step
1. Sow on surface. Basil needs light to germinate. Press into soil, don’t bury.
2. Keep warm. 70-75°F for germination.
3. Thin to 8-12 inches. One plant per 8-inch pot.
4. Pinch flower buds. Flowering stops leaf production.
5. Prune regularly. Cut above a leaf node. Two new stems grow.
6. Water from bottom. Keeps leaves dry, prevents mildew.
Common Problems
| Problem | Cause | Fix |
|---|---|---|
| Black spots | Cold or fusarium | Check stem |
| Yellow leaves | Overwatering | Let soil dry |
| Leggy | Not enough light | Move or add grow light |
| Dying suddenly | Cold | Keep above 60°F |
Common Questions
Why is my basil dying? Usually cold or overwatering. Check both.
Should I let it flower? No. Pinch buds to keep leaves coming.
How do I prune basil? Cut above a leaf node. Two new stems grow.
Can I grow it indoors year-round? Yes, with 6+ hours of light.
Why are leaves turning yellow? Overwatering, cold, or downy mildew.
Can I overwinter basil? Usually no. Treat as annual. Or take cuttings.