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It really depends on yourIt really depends on your soil type; radishes need about 1 to 1-1/2 inches of water a week. What's most important is to water consistently; avoid moisture fluctuations or you'll slow growth and get a bitter taste. You have watered enough if you can press a handful of soil into a firm ball and your finger marks make an imprint on the ball. Your hand will feel damp but not moist, the soil doesn’t stick to your hand, and the ball is pliable.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?