Annual, some winter varieties are biennial
6 to 18 inches
6 to 9 inches
Full sun to part shade
Moist, well-drained, cool
Planting and Care
Radishes germinate and grow best in cool temperatures of 55 F to 65 F. Warmer temperatures result in poor flavor and bolting.
Begin sowing 3 to 6 weeks before the last frost date. Plant seeds 1/4 to 1/2 inches deep. Thin spring varieties to 1/2 to 1 inch apart. Thin larger winter radishes to 6 inches. Space rows 12 inches apart. Radishes can also be sown in an open bed and thinned to ideal spacing.
Radishes help break up the soil for slower maturing carrots, turnips and parsnips when they are sown together.
For a continual harvest, sow in 1 to 2 week intervals until temperatures average 60 F. Resume planting again in fall when the temperatures cool. Or make a single spring planting of different varieties that will mature at different times during the season.
Radishes mature quickly and can be interplanted with later maturing vegetables such as cabbage, tomato or squash.
Varieties to Consider
Burpee White - round, white skin, 25 days to harvest
Plum Purple - deep magenta skin, 25 days to harvest
Icicle - long, slim, white, 25 days to harvest
China Rose - winter radish, white, 52 days to harvest
Round Black Spanish - winter radish, black skin, 55 days to harvest
Dig or pull radishes when the root reaches full size (usually starting when the less than an inch). Proper thinning and well-drained soil are important for proper root development.
Did You Know
Save thinnings of your radishes and use them as tasty additions to salads. Not only is the root portion edible, but the greens are as well.