Answer: Tomatoes are warm-season plants, very sensitive to cold nighttime temperatures. As soon as the nights remain above 50F you can safely set your tomato plants outdoors. If you want to transplant and the nights are between 40F and 50F, you can protect your plants by enclosing them in a cloche. I put a tomato cage around each plant and secure plastic around the cylinder, leaving the top open. This extra measure helps my tomato plants endure chilly spring nighttime temperatures. It isn't necessary to remove the suckers.
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