A-to-Z Vegetable Guide:
How to Grow Vegetables»
Don't believe good things come in small packages? Radishes are nutritional powerhouses. And talk about a burst of flavor!
Planting advice: Plant seeds 1/4 to 1/2 inch deep; thin seedlings to 1 inch apart (2 to 4 inches for winter radishes). In summer, sow a crop of winter radishes, which take longer to mature and last longer in storage.
Harvest tips: Matures in 22 to 28 days; 52 to 70 days for winter varieties. Harvest when the roots are less than 1 inch in diameter, larger for winter varieties.
Radishes don't keep very long, except for winter varieties, which store well for several months if kept cool and moist.
Recommendations: Champion, Easter Egg (various colors), Snow Belle (white), icicle (white, narrow and tapered), China Rose and Tama Hybrid (white, winter).
Source: Birds & Blooms "Grow Veggies for Less"