Soil temperature should be between 40 and 85 degrees to germinate the seeds. Plant seeds in 1/2-inch deep in rows 12-inches apart in full sun. When tops are up thin to 1-inch apart. Radishes need about 1-inch water per week. They are light feeders so blending rotted manure into soil before planting radish seed should be enough. For continuous harvest plant rows every week. For fall plantings, plant seeds 7 weeks before first expected frost. Radishes that can be grown in greenhouses are: French Breakfast and Sparkler. Container varieties are: Cherry Belle, French Breakfast, and Sparkler. Fast growing varieties are: Cherry Belle, Crimson Giant and Scarlett white Tipped. A sower growing variety is Icicle, a long white radish. Radishes good for fall planting are Long Black Spanish and White Chinese.
Harvest radishes once they reach usable size. Red varieties should be firm, smooth, and round with a nice red color. Black varieties should be firm, smooth, round and black in color. White radishes should be firm, slender and white in color. Harvest lasts 2-3 weeks.
- Aphids are present if plant foliage curls, and turns yellow. Spray leaves vigorously with water and rub aphids with fingers.
- Cutworms are present if plant stems are completely severed below the surface.
- Cabbage Loper is present if the leaves have ragged holes. Look for 1-1/2 inch long light green caterpillar with yellow stripes.
Radishes are wonderful addition to any vegetable platter.
Add them to any salad or try my Radish, Cucumber and Corn Salad.
Nutrients in Radishes
- Vitamins B6 and C