Why are my tomato flowers withering rather than turning into fruit?

When a tomato flower is pollinated, the petals will dry up and fall off. If you look closely at the bottom of the flower, you will start to see a tiny tomato forming. If your flowers are falling off and you don't see the fruit forming, it's likely the flower wasn't pollinated.

How do you encourage tomatoes to set fruit?

Most importantly, make sure your tomato flowers are being pollinated. If it hasn't been windy, make sure to give the plants a gentle shake every day to help the flowers pollinate. Keep up with the care of your tomato plants, making sure they are being fertilized, pruned, and watered well.