Basics

Ease of Growing
Easy
Grown as
Annual
Days to Maturity
20-30 (Spring/Summer), 25-35 (Fall/Winter)
Growing Habit
-
Hardiness
Hardy

Very hardy.

Crops
Spring, Summer, Fall
Growing Season
Short, Long
Cultivar Type
-
Growing Conditions
Cold, Cool, Warm

Radishes are most easily grown in spring and fall, as they prefer short days (up to 12 hours long) and cool weather. Temperatures much above 70 degrees F cause them to be very pungent.

Outdoor Growing Temp
45°F - 85°F
Min Outdoor Soil Temp
45°F

Don’t plant your first spring Radishes until the soil temperature reaches at least 45˚ F, which may be around the last frost date.

If you warm the soil up with black plastic or cloches, you could get them going a month earlier than this (they are quite frost tolerant). 

Start Indoors
No
Start Outdoors
Yes
Light
Sun: min. 6 hours daily (Cold, Cool)

In cool weather Radishes are grown in full sun.

Water
Moderate

Radishes must have a steady supply of water for best quality, so keep the soil evenly moist at all times. Too little water can result in woodiness and excessive pungency (such roots are pithy and have marked growth rings). Too much water may encourage top growth at the expense of the roots.

Feeder
Moderate

Low nitrogen. Moderate potassium. Moderate phosphorus. Radishes don't need a lot of nitrogen (don't give them fresh manure), but they do like potassium and phosphorus.

Suitability
Tolerates light frost, Needs summer shade
Small Gardens?
Yes
Containers?
Yes

Radishes can grow easily in an assortment of containers. Grow and thin as you would in a ground garden. Just make sure that your container has a depth of at least 6". Use a pot with good drainage and fill with a mixture of potting soil and compost. Water thoroughly and place in direct overhead sunlight. Radishes need lots of water and sunshine, but they need partial shade in really hot climates.

Attracts beneficial insects?
No
Color
Red
Fruit Size
0.5-"
Plant Height
2.0-3.0"
Plant Diameter
4.0-6.0"
Hardiness Zone
1-11
Disease Resistance
-
Taste Profile

Crisp, wonderful radish flavor.