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Radishes can stand the cooler weather, so I planted them directly in the garden here in early March. I live on the border of the US climate zone 6/7, so we didnt get our last freeze until mid-may.
I am going to see if I can keep them going throughout the summer. They are easy to grow, and succession planting (new seeds planted every couple of weeks) keeps them able to harvest continually.
I have not been super diligent on every couple of weeks, but I have done 3 different plantings since mid-March.

Wow! Thank you for the wonderful information that you gave to me! I love it!!!