Grown because they are ready to eat so quickly after planting, and the cherry red orbs are beautiful and fun. And try doing a quick ferment on radishes for a couple days - it makes them taste like potatoes! Free shipping on orders over $34. 30 seeds per pack. HOW TO GROW: Plant seeds quarter-inch deep in early spring or autumn. Keep moist until germination, in about 7 days. Harvest the bulbs when they are 1 inch in size or larger. The older the plant, the hotter the flavor. Annual.