Answer: Cool-season vegetables include beet, broccoli, cabbage, carrot, lettuce, onion, pea, potato, radish, spinach and turnip. Because they are hardy or frost tolerant and germinate in cold soil they can be planted in winter or early spring. For best quality these crops need to mature during cooler periods rather than in the heat of the summer.
In Southern Arizona cool-season vegetables can also be planted in late summer when the crop will grow into the cooler fall months.
Warm-season vegetables include beans, cucumber, eggplant, melons, pepper, pumpkin, squash, sweet corn, sweet potato and tomato. These do not tolerate frost but need warm temperatures to set and properly mature fruit. However, temperatures too high reduce quality; ex.- sunburn fruit, poor colored tomatoes and poor ear fill in sweet corn.
Arizona State University has published a table of planting dates that you might find helpful. Here's the web address: http://ag.arizona.edu/pubs/garden/mg/vegetable/regions13.htm...
You can print this off and have a ready reference for this and future growing seasons. Hope you find it helpful!
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