(For details on growing many other vegetables and fruits, visit our Crop at a Glance collection page.)
Fast, crisp, easy-to-grow spring and fall radishes sown directly in the garden are ready to eat in less than a month! For best quality, grow them in cool weather, keep the soil constantly moist and harvest them as soon as the roots become plump. Radishes grow best when temperatures range between 50 and 70 degrees.
Small round or cylindrical salad radishes come in a veritable rainbow of skin colors, including red, pink, purple and white.
Large Oriental radishes develop heavy, carrot-shaped roots when grown in the fall.
Rat-tail radishes (R. caudatus) produce edible green seed pods, which can grow to more than 6 inches long.
For more information on types of radishes and our recommended varieties, see our Radishes at a Glance chart.
In spring, sow salad radishes at 10-day intervals starting two weeks before your average last spring frost, continuing to three weeks after your last frost date. Sow rat-tail radishes around your last spring frost date.
In fall, sow all types of radishes at two-week intervals starting eight weeks before your first fall frost, continuing up until three weeks before your first frost date.
When preparing the planting bed, loosen the soil 6 to 10 inches deep, and mix in good compost or well-rotted manure. Sow seeds a half inch deep and 1 inch apart, in rows spaced 12 inches apart. After the seedlings appear, thin salad radishes to 3 inches apart; thin oriental radishes to 8 to 10 inches apart. Seeds typically sprout in three to seven days when sown in 60-degree soil.
Flea beetles make numerous small holes in radish leaves. Cabbage root maggots and cutworms sometimes rasp holes or channels into radish skins. All of these pests are easily prevented by covering the plants with lightweight floating rowcovers.
When sown early and exposed to cold weather, some radishes will bolt (rush to produce flowers) before they develop plump roots. Bolting is rare in radishes grown in late summer and fall.
When pulling radishes in warm weather, cool them right away by dropping them into a pail of cold water. Use a sharp knife or kitchen shears to remove the leaves, then store in the refrigerator for up to three weeks. Large oriental varieties can be left in the ground well into fall and dug just before the soil freezes.
Harvest salad radishes once they are bigger than grapes. Radishes left in the ground too long develop a pithy texture and often crack following heavy rains.
Hot weather and drought encourage the development of spicy flavor compounds, which are similar to those found in horseradish.
To save seeds from open-pollinated varieties, allow three or more plants to bloom together, and wait until the seed pods dry and turn brown before harvesting the seeds. Crush the pods with your hands, winnow or sift them to separate seeds from chaff, and store the seeds in a cool, dry place for up to five years.
Slice or grate radishes into salads and slaws, or layer them onto sandwiches. You also can try eating radishes the European way — with bread and butter. Radishes braised in butter or sesame oil until they just begin to brown have a mellow flavor and succulent texture. Substitute sliced or diced radishes for water chestnuts in stir-fries. A handful of salad radishes provides about 20 percent of your daily quota of vitamin C, along with about 2 grams of fiber, lutein and a range of minerals.
Contributing editor Barbara Pleasant gardens in southwest Virginia, where she grows vegetables, herbs, fruits, flowers and a few lucky chickens. Contact Barbara by visiting her website or finding her on Google+.
Whether you want to learn how to grow and raise your own food, build your own root cellar, or create a green dream home, come out and learn everything you need to know — and then some!LEARN MORE
At MOTHER EARTH NEWS, we are dedicated to conserving our planet's natural resources while helping you conserve your financial resources. You'll find tips for slashing heating bills, growing fresh, natural produce at home, and more. That's why we want you to save money and trees by subscribing through our earth-friendly automatic renewal savings plan. By paying with a credit card, you save an additional $5 and get 6 issues of MOTHER EARTH NEWS for only $12.95 (USA only).
You may also use the Bill Me option and pay $17.95 for 6 issues.