Vegetable Overview: Radishes


Discover how to grow Radishes with instructions on starting seed, transplanting, site selection, care and maintenance, water and fertilization requirements, pests and disease, and harvesting and storage.

Radishes Stats at a Glance

Soil Conditions:  Well-drained, fertile soil

Sun: Full sun

Soil pH Conditions: 5.8-6.8

Planting Instructions

Can I Start Radishes from Seed?

Radish seeds are directly sown into the garden about four weeks prior to the last frost date for your area.  Direct seed into the garden a one inch apart in rows that are a foot apart.  For continuous growth, succession plant every week until the temperatures reach 60°F.


When to Start Seeds: As soon as soil can be worked in the spring.
Time to Germination: 3-4 days
Optimal Temp. for Germination: 55-85°F



When Do I Plant Radishes?

Radishes are cool season crops and can be planted as soon as the soil can be worked in the spring after the last frost and the soil has reached at least 40°F.

Soil Temperature: 40°F


Where Do I Plant Radishes?

Radishes plants perform best in loamy, well-drained soil high in organic matter. As a root vegetable, the soil must be loose and free from stones to avoid interrupting root development.  Incorporating several inches of organic matter into the soil when preparing the bed will improve growth and development.

Soil Type: Well-drained
Sun Exposure: Full sun
Soil pH: 5.8-6.8


How Far Apart Do I Plant Radishes?

Sow  seeds one inch deep, one inch apart, in rows that are 12” apart.  Thin seedlings to two inches apart.

Radishes Plant Care and Maintenance

How Often Should I Water Radishes?

The key to watering Radishes is to maintain a consistent moisture level.  This is especially important during root development. The soil should be moist to a depth of 6”.  Allowing the soil to dry out between watering will result in a slow leaf development and root cracking.

Water the soil around the plant. Overhead watering will encourage disease.  Drip irrigation is best.

Mulch around the plant will help to lock in moisture.


Should I Fertilize Radishes?

Fertilizing decisions should be based on a soil test.  If a soil test cannot be obtained, Radishes generally perform well with a 5-10-10 fertilizer worked into the soil prior to planting.  After emergence, you can fertilize again with a nitrogen fertilizer (21-0-0).

Fertilize the soil around the plant at least 6” from the plant base.  Irrigate into the soil.


Additional Care Instructions

Hand pull weeds that development in the garden as more aggressive cultivation could harm the plant roots.

At the end of the season, remove all spent plants from the garden to discourage mildew.

Radishes Diseases

The most common diseases associated with this plant include root rots.

Radishes Pests

The most common pests associated with this plant include aphids, cutworms, cabbage loopers, and diamond back moths.

Harvesting and Storing Radishes

When Do I Harvest Radishes?

Radishes should be harvested before the warm weather arrives.  Warm weather causes the root to become spongy and have a pungent flavor.

They are usually ready to harvest within three to four weeks after planting.  They should be harvest when small and tender, which for most varieties is about 1” in diameter.


How Do I Harvest Radishes?

Harvest roots by pulling from the tops.


How Do I Store Radishes?

Store in the refrigerator in a plastic bag for up to two weeks.


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