Answer: Aside from warm daytime and nighttime temperatures, heirloom tomatoes aren't too shy about setting fruit. However, if the temperatures are hot (over 90F) the pollen is rendered sterile and won't pollinate the flowers. There's not much you can do about the weather other than just be patient. When the growing conditions suit your plant it will set fruit. You might consider using a fruit set spray on the open blossoms. It's available at most garden centers. Good luck with your tomatoes!
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