A number of factors can cause your tomato plant to not set fruit, including water, temperature, poor pollination, fertilizer, not enough sunlight, stress from insects or diseases. Recently, we’ve gone from warm and dry conditions to cool temperatures and rain, then back to warm and dry again. Fluctuations in the amount of water your tomato plant receives can cause a lot of problems, including blossom drop. You may notice the new blossoms wither right on the vine. When you do water, irrigate your plants, don’t sprinkle them. You want to water at the base of the plant, not the top. If you can, water in the early morning so the plant doesn’t sit wet overnight. Take into account any rain fall we might have had as part of your plant's weekly water needs. It’s better to water less frequently and really soak the soil. Go easy on the fertilizer. Too much Nitrogen (the first number on the package) can cause blossom drop. Steamed Bone meal is a great product to use now that your plants are flowering. If you’re not sure what the problem is, bring us a sample. We’ll figure what’s going on and help you decide the best solution.