A couple of months ago, I purchased a small Meyer Lemon tree and planted it in a pot. I have been watering it every other day (I live in Phoenix, AZ) It has been over 100 degrees for the past 2 weeks and all of a sudden after many blossoms producing many small lemons, the lemons are suddenly all turning black and falling off. Am I watering too much or not enough? Or is there something else that I am not doing? Please help!