Answer: Kale is one of those cool-season crops that grows best in the early spring or fall months and turns sweeter after a frost. It sounds as though your kale is about to bolt (produce flowers) due to the summer heat (which also turns it bitter). Taste-test a leaf or two. If it's still edible, harvest the older leaves to use in cooking, or the more tender, newer leaves for use in salads.
Q&A Library Searching Tips