I have a nice plant in a good sized container that is about 3 feet high. It has one large tomato growing near the bottom and only a few flowers near the top. How do I encourgae more flowering and more tomatoes? The plants are getting about 5 hours of sun per day, as it has been in the high 90's here the last two weeks and the soil drys out fast. I have the plant near my oak trees so it gets late afternoon shade from the blistering sun.