How to Grow Radishes

Choose the type of radish you want to plant. Like many vegetables, radishes come in numerous varieties, including hybrids and naturally-pollinated types. If you’re a beginner gardener, try planting the Cherry Belle variety because it matures in just 22 days and has a mild, pleasant flavor.

• Spring radishes are the most common type (like Cherry Belle, which has red skin and white flesh). Be sure to plant them in spring or fall, as they tend to grow the fastest.
• Summer radishes are similar to spring varieties, but they grow slower, taking about 6-8 weeks to reach maturity.
• Winter radishes are larger and starchier than spring and summer types, and take longer to develop. It’s best to plant them in late summer to harvest in fall or winter. Winter radishes include Daikon and Champion. Daikon can grow up to 45 cm long and takes 60 days to mature.

Choose the Right Location for Planting. Radishes thrive in full sunlight or partial shade. The soil should be loose, well-draining, and free from rocks, as roots may branch around obstacles. Prior to planting, enrich the soil with organic matter.

• Ensure the plants receive ample sunlight. If they don't, they will mostly develop leaves, and the root will remain small. However, keep in mind that the hotter the soil, the hotter the radishes will grow. That's why it's advisable not to plant radishes in the peak of summer. Additionally, too much sunlight may cause the radish to go to seed.
• The soil should be rock-free, well-draining, and have a pH level between 5.8 and 6.8. Add plenty of organic matter (like compost) to the soil.

Plan Your Planting. Radishes are cool-weather crops, so the best times to plant them are in spring and fall. Planting them during the hot summer months will cause them to bolt. You can plant your first batch 2 weeks before the last frost of spring as radishes tolerate cold temperatures well.

• Stop planting once the weather turns hot. If the temperature remains above 16°C for several days, it’s best to wait until it cools down before planting more radishes.
• For typical spring radishes, they will germinate in about 5 days, and you can harvest them in 3 to 4 weeks.
• Since radishes grow quickly, you can plant them alongside slower-growing crops.

Sow the Seeds. Plant radish seeds at a depth of around 12.5 mm, spaced 25 mm apart. Once the seeds germinate, thin out the seedlings to maintain a spacing of about 5 cm, providing enough space for the larger varieties. Rows should be spaced 30 cm apart.

• When the seedlings reach about 2 to 3 cm in height, you will need to thin them out. Use small scissors to snip the tops of the seedlings, cutting down towards the soil.
• If planting larger radish varieties, the seeds should be sown at a depth of 2.5 cm to 4 cm.
• Radishes grow quickly and pair well with other plants. Consider planting them alongside carrots, golden beets, or cabbage.

Water the Plants. Keep the radish bed moist but not waterlogged. Regular and consistent watering will promote rapid growth; slow-growing radishes tend to become hot and tough. You can also add compost to the bed to enhance growth.

• Irregular watering (such as skipping several days of watering and then overwatering) can cause the radishes to crack.

Harvesting Radishes. Radishes are ready for harvest when their roots reach about 2.5 cm in diameter. However, check your seed packet for the specific harvest time for your plants. To harvest, gently pull the entire plant out of the soil.

• You can also shake off the soil to check if the roots have grown large enough. If they have, pull a few out and taste them. This will give you an idea of whether it's the right time to harvest.
• Unlike many root vegetables, radishes cannot be left in the ground for too long, as this will cause them to become tough and bitter.

Wash and Store Radishes. Gently shake off the soil from the radishes, then store them in a cool, dark place for up to two weeks. Be sure to wash them with water before eating.

Handling Fungal Problems. There are various types of fungi that can damage your plants or affect their flavor. Signs of fungal infection are usually quite obvious.

• If yellow and light gray spots appear on the leaves, your radishes may have leaf spot disease, also known as Septoria leaf spot, caused by a fungus. To prevent this, ensure proper drainage in the planting beds and add organic matter (like compost). Remove infected plants and rotate your crops to avoid planting in the same bed every season. Also, keep your garden tidy by removing dead plants and weeds.
• If you notice pale green spots on the top of the leaves with purple fuzz underneath, your plants may be suffering from downy mildew. Remove affected plants and avoid over-watering. Thin out your radishes to avoid overcrowding. For prevention, practice crop rotation and clean your garden thoroughly.
• If the leaf veins turn yellow, the edges curl up and turn brown, and the plant's base turns dark brown or black and becomes slimy, you might be dealing with root rot, a fungal disease. Add organic matter like compost and ensure the soil drains well. For prevention, rotate your crops.

Eliminating Harmful Pests. Fungi aren't the only threat to your radish plants. Various pests can latch onto your plants, feed on them, and cause them to die. To prevent pest infestations, keep your garden clean by removing plant debris and weeds. If pests have already infected your plants, here are a few ways to eliminate them.

• If the leaves appear pale and you notice small grooves or indentations in the roots, your plants may be infested with maggots. These tiny, legless creatures are gray or white in color and are fly larvae that have hatched in the soil next to the plant. To eliminate them, apply lime or wood ash around the base of the plant. Wait until the weather is drier before replanting to break the maggot life cycle.
• If you spot small holes in the leaves, you might be dealing with flea beetles. These tiny, copper or black creatures with hard wings can be controlled by sprinkling diatomaceous earth, a soft sedimentary rock that breaks into fine white powder, around your plants. It naturally kills the beetles. Additionally, till the soil regularly to disrupt their life cycle.
• If your plants have pale white or yellowish spots, distorted leaves, or wilting, you could be dealing with Harlequin bugs. These pests are known for their black and yellow or red-orange stripes and suck the plant's sap. Catch and destroy all the bugs and their eggs. To prevent them, keep your garden clean and remove any weeds and post-harvest plant matter that could serve as breeding grounds.
• If the leaves turn dull yellow, curl up, and become brittle, your plants may have contracted dragon’s broom, a disease caused by a mycoplasma virus spread by leafhoppers. Remove infected plants, and prevent further infestations by clearing weeds and dead plants from the garden.

Check the Soil. The soil temperature, type, and watering method play a significant role in how well your plants will thrive. Remember to water regularly, avoid overwatering, and ensure the pH level is appropriate.

• If your radishes taste too hot or spicy, it indicates that the soil is too dry or the soil temperature is too high (above 32°C). To protect the roots and cool the soil, add a 5-7 cm layer of organic mulch.
• If the radishes are too tough, the soil temperature may be too high, and watering may be inconsistent. Make sure the roots are covered by soil to keep them cool and water frequently. Additionally, when the plants are large enough, harvest them promptly to prevent them from cracking.

• Radishes can also be grown in containers, and with the right conditions, can even be cultivated indoors.
• If the plants start flowering, don't immediately discard them. After the flowers fade, they will produce seeds that are spicy and crunchy if harvested while still soft and green.

• Radish seeds
• Compost organic fertilizer
• Shovel
• Water