After fertilizing basil plant it seemed to stop growing. I used organic pellet fertilizer 4-2-8 with seaweed, dehydrated hen manure, potash sulphate and feather meal and put the recommended amount as per the package. The leaves seem to be curling and I have a few leaves that got brown tips and the growth looks stunted. Could it be too much fertilizer even if the package says it was correct? What would I do to fix that?