Answer: Tomatoes are warm-season crops that will sometimes refuse to flower and set fruit when nighttime temperatures are below 50F. The weather has been unseasonably cold for June, and even if you're growing short-season varieties of tomatoes, they may still be reluctant to set fruit. Make sure that your plants are getting as much direct sunshine as possible and hold off on the fertilizer. Too much nitrogen will promote lush, green growth at the expense of fruits. As soon as typical summer weather arrives in the Pacific Northwest your reluctant plant should bear fruit.
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