Following the advice of Meyermike and using Foliage Pro on my potted Meyer Lemon tree. It has been outside since late April and had two flushes of flowers but no lemons and has put on new leaves. It is looking quite healthy. I am going to try adding a tablespoon of vinegar to a galleon of water along with FP to see if I will get another flush of flowers and perhaps lemons. I use water from the tap. Any other suggestions?