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Spring radishes are ready toSpring radishes are ready to harvest 21 to 60 days after sowing. They mature rapidly so you do want to keep an eye on them. The best way to determine when the radishes are ready to harvest is to simply push back a little soil to see if a bulb has grown and then pick and taste a few. The roots are mature when they push out of the ground a little and measure about 1 inch across. 

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