I have a very large Basil plant that I inherited from a friend. I don't know how old it is but it is over 2 feet tall and the stems are woody. It was growing beautifully for about 2 months, but lately it has been having problems. All the new leaves have been coming in dark green and deformed. They have jagged edges and are curled. The underside even looks deformed. These leaves look nothing like any of the older leaves. I have searched everywhere, but cannot find answers on this problem. Now leaves are falling off a lot and I don't know what to do.
Does anyone have any idea what it might be, and what I can do?