You may notice this happening on your plants this late spring. When soil continues to be cool, tomato plants can sometimes get a purple cast to them. It is a issue with the plant being able to take up phosphorus when the soil is cool/cold. As the season progresses and soil temps warm up, it should correct itself. No need to intervene if your soil is healthy. If it continues throughout the year, you may have soil deficiencies. Warm weather crops like tomato, peppers, basils etc. do not like temps below 50 degrees. Well, that's about every night this week! Still not too late to plant veggies transplants, two more weeks might be stretching it, but then pick shorter day crops. Don't plant late season peppers July 4th!
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