How to Grow Radishes From Seed

Radishes are a cool-season crop, so sow them in the mild weather of spring and fall. Start small salad radishes as soon as the soil can be worked in spring, then sow a fresh short row every one to two weeks for a steady supply. Radishes bolt and turn hot in summer heat, so pause sowing once days get warm and resume in late summer. Large winter and daikon types are a fall crop: sow them in mid to late summer so they mature in the cooling days of autumn, about two months before your first hard frost.

Radishes are direct-sown; they grow too fast to bother starting indoors. Loosen the soil, remove stones so roots grow straight, and sow seeds about half an inch deep and one inch apart in rows or wide bands. Water gently and keep the bed consistently moist, and seedlings appear in just 3 to 7 days. Once the first true leaves show, thin small salad radishes to about 2 inches apart and large winter or daikon types to 4 to 6 inches, because crowded radishes make leaves instead of roots.

Radishes are easy as long as they never stop growing. Keep the soil evenly moist so the roots stay crisp and mild, since dry spells make them woody and fiery and uneven watering can split them. Avoid high-nitrogen fertilizer, which pushes lush tops at the expense of roots; a soil with modest, balanced fertility is ideal. Keep the bed weeded, give full sun, and simply harvest small radishes promptly, as most salad types are ready in just three to four weeks.

Radishes are quick, friendly neighbors that fit almost anywhere. They mark slow rows, loosen soil, and grow well beside many crops. Marigolds, nasturtiums, and basil all help by deterring or trapping the pests that bother radishes, and they are easy to add in one click:

Radishes are best picked young and never left to linger. Pull small salad radishes as soon as the roots reach full size, usually about half an inch to one inch across and just three to four weeks from sowing, since holding them longer makes them woody and hot. Simply grasp the leafy top and lift. Large winter and daikon radishes are pulled in fall once full-sized but still tender, and these bigger roots store for weeks in the fridge or a cool cellar.

Crisp, peppery radishes are one of the most versatile quick crops. Slice small salad types raw into salads, tacos, and sandwiches, or serve them whole with butter and salt in the classic French style. Roasting mellows and sweetens them, and the leafy tops are edible in soups and sautes. Large daikon and winter radishes shine grated into slaws, pickled, or simmered in soups and stews, and every type delivers vitamin C and a fresh, lively crunch.

• All leaves, no root: too much nitrogen, crowding, or heat. Thin seedlings, skip nitrogen-rich feed, and grow in cool weather.
• Woody, hot, or pithy roots: growth stalled or the radish sat too long. Keep soil moist, grow fast, and harvest small salad types on time.
• Bolting (flower stalks): warm days or long daylight in summer. Sow in spring and fall and choose bolt-resistant varieties for late sowings.
• Split roots: uneven watering after a dry spell. Keep the soil consistently moist rather than swinging from dry to soaked.
• Flea beetles and root maggots: tiny holes in leaves or tunneled roots. Use row cover, rotate beds, and plant trap crops like nasturtiums nearby.