How to Grow Radish from Seed to Harvest: Check How this Guide Helps Beginners

Radish is one of the easiest vegetables to grow from seed. They are quick to mature, and there are several types to choose from, so it’s never boring. Seeds produce Radishes and are usually the form home gardeners use for planting because they grow faster, especially spring Radishes. Round or oval seeds are some shades of brown, depending on the different types of Radishes. These seeds come from seed pods produced by the mature plant and can remain viable or last for five years. Radish seeds are between 2/5 and 4/5 inches in length.  

How to Grow Radish from Seed to Harvest
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How to grow Radish from seed to harvest

How long do Radishes take to grow from seed to harvest?

  • Radishes are easy to grow from seeds and ready to harvest in at least four weeks. These compact plants can also be grown in the smallest gardens and are great gap fillers on the vegetable plot. You can sow small batches every few weeks for harvesting during the summer to add crunchy tang to your salad. Since Radishes mature so quickly, you can sow them anywhere there is a space or between rows of other vegetables like Carrots or Beets. 
  • Garden Radishes are usually ready for harvesting three to five weeks after planting. You can pull them up whenever they reach a usable size. If left too long in the ground, they will get fibrous and develop a strong taste. 
  • Depending on the variety, Radish harvesting time may change, so always check the back of your seed packet to ensure you cut them at peak maturity.

How many Radishes do you get from a seedling?

A Radish seed produces only one Radish plant, and a Radish plant produces only one Radish. Fortunately, Radish grows very fast, so plant many seeds if you want too many Radishes, and you’ll have an abundance of Radishes in three to four weeks.

How many Radish seeds are in each hole?

If your seeds are new, you can plant one per hole. But if they are a few years old, put two or three in each hole, then thin them later. Every seed that is planted will not sprout. If you’re planting seeds in a small pot, you won’t be able to transplant them. If your pot isn’t big enough, it will be difficult for the seeds to grow, and it may result in a seedling that doesn’t survive transplantation.

In case you missed it: Homemade Fertilizers for Root Vegetables: Potatoes, Carrots, Beetroot, Onions, Radishes, Turnip, Ginger, and Garlic

Radish harvest
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Can you leave Radishes in the ground over winter?

They can’t withstand hard frosts without any covering or protection. Hardy cool-season crops (Cabbage, Broccoli, Onion, Radish, Spinach, Turnips, Peas, and Radish) grow in 5°C temperatures and can handle some frost nights without protection. If the weather is cold, you can keep winter Radishes in the ground for a few weeks after maturing. Finish the crop before frost.

Do Radishes need full sun?

  • Radish prefers full sun but grows well in partial shade and prefers full shade in warmer summer climates. Keep the soil moist, and you will be rewarded with a cluster of mildly peppery roots in no time.
  • It is a fast-growing vegetable ready for harvesting in just 30 days; Radish is one of the best vegetables to grow in the shade. Radish plants prefer full sunlight, but they can tolerate partial shade. Choose a planting area that receives at least six hours of daylight daily.

How do you speed up Radish growth?

  • You can plant Radish seeds in the spring about three to six weeks before the last expected frost in your area. It promotes rapid growth and gives time to mature before the temperature rises above 19°C. Thin Radishes 2 inches apart as they emerge. Radishes that are crowded grow slowly and do not produce young roots for harvesting. 
  • Water your Radish thoroughly to moisten the ground on the root level once or twice a week. Check and water them frequently whenever the soil feels dry to touch 1 inch below the surface. Radishes need equally moist soil to grow faster and produce tender roots. 
  • As soon as your Radishes appear, pull the weeds by hand regularly. This prevents weeds from robbing your Radishes of the moisture and nutrients they need to grow faster and produce delicious roots. Harvest the Radish as soon as it reaches the edible size, usually 1 inch in diameter. If the Radishes are allowed to grow too big, they become hard and pithy.

What happens if you leave Radishes in the ground too long?

  • If you leave them long before the Radish is harvested, the root becomes quite pithy, and as the temperature warms, you risk the plant’s bolting.
  • If you keep them too long in the ground, the roots taste bitter, and the texture is wooden. Also, the plants will go for flowers (which are great for pollinators but not so good for salads). A wooden structure signifies that Radishes have passed their ideal harvest time. 
  • If Radishes don’t get the cool temperature, they need plenty of regular water, they’ll take a longer period to reach mature size, and you may be tempted to leave them in the soil until they’re filled out. 

What do you plant after Radishes?

  • The plants that support Radishes can be the strong-smelling herbs, nasturtium, and species (such as Onions) in the allium family. Pole Beans and Sweet Peas, which rise high from the garden on the stakes, help fix nitrogen in the soil and increase yield while resurfacing the soil for other high nitrogen feeders such as Lettuce.
  • Radish loosens the soil when they sprout and allows the carrot roots to grow more easily. Radish grows faster than carrots, so you can plant Radish seeds only when you plant carrot seeds; when the carrots start growing, they will loosen the soil.

In case you missed it: 18 Common Radish Plant Problems: How to Fix Them, Solutions, and Treatment

Radish seedlings
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How big should Radishes be when you pick them?

  • Check the size of your Radish before picking by removing the upper layer of soil around one of the plants. Once grown to about 1 inch in diameter, Radishes are ready for harvesting.  
  • When you think of Radishes, many people think of the small, round red variety of Radishes, but the fact is that there are different types of Radishes in different colors and sizes. Knowing what kind of Radish, you are growing will tell you when to pick Radishes.

Why are my Radishes all tops and no bottoms?

  • When Radish grows all tops, no bottom can be a disappointing ending for your Radish crop. This is due to too much nitrogen fertilizer. Excessive nitrogen fertilization can encourage beautiful Radish tops that have very little Radish underneath.
  • A common cause of Radish not forming bulbs is overcrowding. Overcrowded Radish doesn’t have the room they need to produce fleshy bulbs, so thinning at a distance of two inches can help promote bulb formation. Radish like full sun and requires at least 6 hours of light to produce a suitable bulb.
  • The hot weather is the biggest reason for only growing greens in Radish. Once the weather gets hot, the Radish plant bolts and tries to set the seed. The lack of growth is caused by planting thickly and not thinning about 1 to 2 inches between the plants.

Should I trim Radish leaves?

  • Once the seedlings are 2 inches long or about a week old, it is necessary to thin the Radish to a distance of three inches. Crowded Radishes don’t grow well, and you’ll get small, unattractive roots. To thin, just cut the green on the soil line. 
  • You can cut them on the ground surface or pull the entire plant. You can cut the root and separate it from the greens. Wash the greens dirt-free, and then it will be ready to use.

Do Radishes need a lot of water?

  • Drought stress develop a poor taste and a tough texture. You should soak the soil thoroughly at least once a week if the planting does not receive an inch of rain per week. 
  • Radish requires 1 inch of water per week. Give your plants a little water daily. Just give them 3 cups of water per square foot of soil. 
  • Radish plants can handle light waterings 4 to 5 times per week; ensure the soil is not too dry. One of the best ways to keep the soil moist is to mulch with grass clippings, straws, or newspaper strips.
  • You must keep the seeds moist until they germinate for about 5 to 10 days. Once the seedlings are up, thin to 1 to 2 inches. Try not to give one bunch of water at a time, as it can split the bulbs.
  • Water your Radish thoroughly to moisten the ground on the root once or twice a week. Check and water them frequently whenever the soil feels dry to touch 1 inch below the surface. Radishes need equally moist soil to grow faster and produce tender roots.

Do Radishes need fertilizer?

  • Before planting your Radish, you should add some all-purpose fertilizer to the soil. Apply about 0.45 kg of 16-20-0 or 10-10-10 fertilizer per 100 square feet.
  • No additional fertilization is required after planting the Radish. Radish grows best in soil with a pH between 5.5 and 6.8. For new beds, do a soil test at the site at least a month before planting.
  • Radish likes plenty of phosphorus, so use something like a bone meal if you plan to add fertilizer before sowing. Too much nitrogen will encourage heavy growth and discourage root bulbs. Kelp meal is filled with micronutrients and will provide trace minerals to crops that will be consumed. 

In case you missed it: Best Fertilizer for Radish: Homemade, Organic, NPK, Liquid, Natural, and Compost Manure

Radish farming
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Why do my Radishes grow long and skinny?

  • The Radish will become longer and thinner in response to warmer weather, unsuitable soils, and competition with other plants. Excess nitrogen in the soil can cause the Radish to grow long and thin.
  • Another reason that the Radish will become longer and thinner is because of competition with other plants. When too many plants are in an area, they compete with each other for nutrients and water.
  • Also, when the Radish is planted too close to each other, there is nowhere to go to the roots physically. Since they cannot be wider, they grow longer, going deeper into the soil in search of nutrients and water. 

Can I grow Radishes in pots?

  • Radish is one of the fastest-growing vegetables. Planting Radish seeds in pots produce food quickly and with minimal effort.
  • To maximize your yield, look for a wide pot (either long or round with a large diameter) at least 6 inches deep. You may need a 10-inch-deep pot if you are growing an oblong Radish.
  • Container gardening Radish requires organic amendments with a wide gallon pot and well-drained soil. Use a vegetable starter mix, or mix a combination of compost and peat mixed with a small amount of sand or other grit. Mix in vegetable fertilizer before planting to start root growth after Radish seeds germination.
  • Radishes can be started indoors, but like most root crops, they are difficult to transplant successfully into the garden. Allow two additional weeks to maturity due to root insult in transplantation if started indoors and transplanted; cut off the tip of the long thread of Radish root when transplanting.

How deep do Radishes need to grow?

  • Pay attention to the appropriate depth of planting when you plant. Seed directly into the soil about 1/2 to 1 inch deep in rows at a distance of about 18 inches.
  • Allow about an inch between the seeds in a row. Plant small varieties of seeds shallow, one-quarter to one-half inch deep. Apply large varieties deep, up to an inch deep.
  • Globe Radishes are shallow roots and quick growing, requiring frequent, uniform irrigation for maximum growth and tenderness. As soon as possible, there may be enough rainfall to mature the crop on the plantation; later, a total of 5-6 inches of water may be required depending on the plantation date, seasonal variation, and variety.

Where do Radishes grow best?

  • You can grow Radishes wherever there is sun and moist, fertile soil, even in the smallest city. You can grow early varieties in the cool days of early spring, but some later maturing varieties can be planted for summer use.
  • You should choose a sunny place with at least six hours of sun a day. If the Radish is planted in too much shade, it will put all its energy into producing larger leaves. 
  • Radish performs best when grown in cool conditions and is tolerant of cold weather. Loosen the soil before planting one foot or more for at least six-inch deep, long varieties. Plant seeds from April to early May and then in August. 

In case you missed it: Growing Radish In Greenhouse – A Full Planting Guide

Radish plant
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How do you protect Radishes from pests?

  • Use a floating fabric row cover to keep insects away from the plants. You should give enough space for good air circulation and remove weeds around the plants to prevent the dark, moist conditions pests desire. 
  • Put Mint, Rosemary, and Sage plants in the Radish Garden to remove the cabbage maggots. Before planting the mint plants in the garden, cut them down and plant them in plastic pots 10 inches deep. 
  • Sprays of monocrotophos or malathion at 10 to 15-day intervals effectively contain the aphid population. 

What kind of soil do Radishes like?

  • Radish needs well-drained, slightly acidic to neutral soil with a pH of 6 to 7. Radish works best on light, sandy, well-drained soil. It also makes it easier to grow and wash the roots after harvesting. 
  • Radish isn’t very picky when potting soil, but it will perform best in soil that drains well and is high in organic matter. A well-fertilized organic potting soil will do great. Radishes prefer fertile, well-drained, deep, sandy soils rich in organic matter for optimal growth. Heavy soil must be modified with sufficient compost to allow good root growth.

Why do Radishes split in the ground?

  • Cracked or split roots are often caused by inconsistent water, especially sudden soaking after a drought. You should water a little and often help prevent splitting and to ensure good drainage to deal with excess rain.
  • Sometimes, the Radish split up as they mature and age. Cracking is often the result of uneven water. Trying to meet a period of drought with too much water at the same time will cause the Radish to grow too fast from the inside and split open. Ensure your Radish gets at least 1 inch of water per week consistently.

What can you not plant near Radishes?

  • Be careful when planting near Brassica, however, as Radish can attract fleas, damaging the plant’s leaves. Hyssop is also not compatible with Radish. Do not plant Radish with Cabbage, Cauliflower, Brussels Sprouts, Broccoli, or Turnips.
  • Hyssop can prevent Radish from growing well. When planted with Radish, it causes stunted growth. Turnips can hinder the growth of Radish. They should not grow together in the garden.

What time of year do you plant Radishes?

  • Plant Radish seeds from early April to early May for the spring crop and then plant them for the fall crop from August 1 to September 1. Allow about an inch between the seeds in a row. Plant small varieties of seeds shallow, one-quarter to one-half inch deep. Plant large varieties deep, up to an inch deep.
  • Sow Radish in the garden 2 to 3 weeks before the average date of the last frost in spring. The Radish succession plant can occur every two weeks from early spring to late spring and in late summer and autumn. It takes 22 to 70 days for the Radishes to come for harvesting.

What is the fastest way to germinate Radish seeds?

  • You can soak Radish seeds before planting to encourage faster germination. Keep them in water and let them sit for 24 hours before planting. However, this is not required as long as the growing source is moist and hot; Radish seeds should grow well.
  • Radishes can be grown all season, but they are easiest when sown immediately after the last frost date, at the end of summer, and in the fall. The best temperature of the soil is 18°C to 24°C. Seeds may sprout in 5 to 7 days.
  • Seeds should be planted 1/2 inch deep. Radish grows best when the temperature does not exceed 27°C.

In case you missed it: Growing Hydroponic Radish, Process, Requirements

Radish garden
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What is the yield of Radishes?

  • The yield per hectare depends on the variety and number of crops per year. Regular Radish produces 10,000 to 15,000 kilograms per hectare. Chinese Radish can produce 30,000 to 44,000 kilograms per hectare.
  • The early mature variety is ready for harvesting 45 days after sowing. The roots are long, white, and free from hair. Suitable for sowing in the main season as well as in the off-season. 


Radish matures incredibly quickly (with some varieties taking only three weeks from seed to maturity), which is very hard. Their peppery taste adds a kick to soups and salads, and they take up little space in the garden. Radish is a cold weather crop. Grow Radish in the spring or fall for the best flavor and texture. Radish seeds are ready to eat at least three weeks after sowing. It is easy to understand why Radish is a favorite of home gardeners.



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