How to Grow Radishes

Did you know that radishes are related to cabbages and cauliflowers? Grown for thousands of years, these cheerful root vegetables are super quick to germinate.


Radishes grow in sunny or partly shaded places. Keep the soil moist. The roots are ready to harvest a month after planting. Eaten whole or chopped up in salads, radishes have a crunchy texture and a delightfully peppery taste — and they're packed with vitamins! This project takes four weeks to complete.

Materials Needed:

  • radish seeds
  • potting soil
  • garden planter

1. Plant radish seeds.

Make sure there are no large lumps in your soil, and plant the seeds about 1 in (3 cm) apart and about 1/2 in (1 cm) deep.

Radish Seeds

Radish Seeds

Photo By: DK - Ready Set Grow! ©© 2010 Dorling Kindersley Limited

DK - Ready Set Grow!, © 2010 Dorling Kindersley Limited

2. Tend to radishes.

In about two weeks your radishes will begin to germinate. Keep an eye on them, since you may have to thin them out. Make sure the soil is well watered, especially in dry weather.

Radish Seedlings

Radish Seedlings

Photo By: DK - Ready Set Grow! ©© 2010 Dorling Kindersley Limited

DK - Ready Set Grow!, © 2010 Dorling Kindersley Limited

3. Check for progress.

You'll be surprised how quickly your radishes develop. If conditions are just right, they can be fully grown in about 18 days.

4. Harvest your radishes.

Your radishes will probably be ready to harvest in three to four weeks. It's best to eat them soon — they'll turn woody if you leave them too long. Keep in mind that radishes sown in the summer months will need more watering and care.

5. Repeat sowing.

It's a good idea to sow radishes at intervals of about 10 days, so you get a continuous crop to harvest. In fact, it's best to sow only a few radishes at a time, since they don't keep and taste best as soon as they mature. If you find your radishes taste a bit too peppery, try peeling them before eating them — most of the strong taste is in the skin.

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