Answer: Tomatoes are warm-season plants that need nighttime temperatures above 50F degrees before they'll set fruit. If the blossoms are falling off your plants it's a sign that the temperatures are still too cool, or that there's no insect activity in the area. You can try pollinating the open flowers by gently shaking the branches with open flowers. This will dislodge the pollen so it can fall on the female parts of the flower. Best wishes with your tomatoes!
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