Radishes are pretty easy so long as you give them basic care, weeding, thinning, and watering.

Water Needs

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.

Fertilizer Needs

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.

Watering, regularly

Water, 0.5 inch(es), regularly, 2 times a week

It is important to keep the soil evenly moist for best quality roots.

Watering also depends on your local weather; don't water if it's raining, or water more frequently if it's dry. Just be sure to keep soil moist for the best crop. The best way to know how much moisture is in your soil is to feel 2" below the soil line. If it's dry, water.

Weeding, regularly

regularly, every 2 weeks

These small plants don’t compete with weeds very well and won't produce good roots if they are crowded. Keep them well weeded. The best way to weed Radishes is by hand. Don’t use a hoe too near the plants as you can easily damage the shoulders of the roots.

Thinning, after sowing

2 inch(es) apart, after sowing, 1 time

Proper thinning is absolutely vital if you are going to grow good Radishes. If the plants are crowded they won’t produce useful roots. When all the seeds have germinated they should be thinned to 1 - 2" apart.

Support

No