Seedlings, with their tender new leaves, often give up the ghost when temperatures dip to 32-33☏. Of course, there are exceptions to this rule. The general rule of thumb is that most plants freeze when temperatures remain at 28☏ for five hours. When you see the first signs of green, remove the cover. This helps keep the seeds moist before they germinate. To speed germination, cover the pots with plastic wrap or a plastic dome that fits over the seed-starting tray. Radishes are a cool season crop, preferring temperatures between 40-70☏. Soils with pH below 6.5 may require liming. Radishes prefer light, sandy loams with pH 6.5 – 7.0, but will tolerate a wide range of soil types. What temperature can radish seedlings survive? Plants you don’t have to worry much about are beets, Brussels sprouts, carrots, collards, kale, parsley and spinach.
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