Question: Why don’t my tomatoes set fruit? They flower, but it looks like something is cutting the flowers off before they are pollinated.
Answer: In many cases that’s tied to the variety and temperatures. Large-fruiting types such as Big Boy and Beefsteak, among many others, won’t set fruit when temperatures are in the low 60s at night, or when they’re in the 90s in the daytime. In the Midwest, those temperatures fit almost all summer, but here in Texas we have only a narrow window of time in late spring when temperatures are right for fruit set with these big varieties. Medium-sized types, by comparison, will set at both cooler and hotter temperatures.