These vegetables are grown as annuals -- kohlrabi is a cool-season crop and yardlong beans and white eggplants are warm-season crops.
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They germinate best and grow best in warm weather, so plant in the spring when the soil temperatures warm up to about 75 degrees Fahrenheit. A type of pole bean, they grow on long twining vines that reach 8' or 10' long. To give the vines the support they'll need as they grow, you need to build trellises or tepees.
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