The most common reason for basil wilting is because of dry soil. Basil requires porous, moist soil and frequent watering in hot weather to prevent a wilting or drooping appearance. Small pots dry too quickly in the sun and cause basil to wilt.
How do you save a droopy basil plant?
Give the plants time to grow new foliage, and then prune off the wilted and damaged parts of the plant. Covering the plants with an upside-down box during late spring freezes protects them from damage. Extreme heat can also cause wilt. If you keep the soil moist, basil plants usually perk up after temperatures cool.
Why is my basil floppy?
Basil plant droop that appears suddenly on young plants is often caused by fusarium wilt, a fungal disease that causes stunted growth and droopy, wilted or yellow leaves. The first signs of trouble are decreased growth and leaves with a cupped appearance. Eventually, leaves may drop from the plant.