"Regular" radishes have hot, spicy roots that are eaten raw. Can be used in salads, as a appetizer, pickled, as a garnish, etc. The leaves are often a potherb. Very edible tender pods. Seeds are an oil seed. Seeds can be sprouted. Dried seed sprouts apparently make a good salt substitute.
Radishes are a hardy, quick-growing crop that can be ready in as early as 3 weeks. They prefer cool, moist, loose and fertile soil, but essentially these are root crops and need loose soil to grow. They need the soil to be constantly moist - they do not like drought conditions. They are moderate feeders, so they also need some fertilization.
ALL/Matures 3-9/Harvest 0-2/Yield 100-540/Spacing 2" or broadcast