While we take a break from growing head lettuce in the hottest months of the year, we aim to grow salad mix all year long. However, this can be a struggle in the middle of summer for the simple reason that it is very hard to get lettuce to germinate in hot weather. I finally discovered the reason why this week and found it fascinating. Lettuce is a descendant of a wild plant originating in the Mediterranean area, where summers are hot and dry, meaning that any wild lettuce that germinated in the summer would most likely die. As an adaptation to avoid this, wild lettuce and its descendants that...
New Discoveries
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