I was asked by several people about my reaction to the recent change in the USDA’s plant hardiness zone map.
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The difference between Southwestern desert plants and other types of plants used for landscaping is the timing, or when the water is applied.
Tomatoes stop setting fruit when air temperatures stay consistently above 95 degrees. The tomatoes that set earlier continue to grow and mature when it stays hot. If the air temperature drops below 95 for a couple of days, new flowers will again set fruit.