Hello! I have planted tomatoes for the first time this year. I planted 3 heirlooms that I got from a local farmer. I planted a Costoluto, a Cherokee Purple and a Reisentraube. The problem is with the Costoluto. It is going like gangbusters and is about 4-5 ft tall, looks healthy and has flowers. The problem is that the flowers are falling off. They break off about 1/8 in above the bloom. I planted the Cherokee at the same time and it is already got small fruit on it. any help would be great!

Thanks!