Leaf curling like that is typical of some pest problems or possibly some diseases, more likely a pest though.
Sometimes basil can be reinvigorated by a significant cutback.
Make sure it has plenty of nitrogen as well.
Leaf curling like that is typical of some pest problems or possibly some diseases, more likely a pest though.
Sometimes basil can be reinvigorated by a significant cutback.
Make sure it has plenty of nitrogen as well.