Try sowing two or three different varieties and carry out a taste test.
Summer cultivars are sown from March to mid-August.
Radishes can be sown straight into the ground where they are going to grow, so make sure the space you are going to sow is weed-free by using a trowel to remove any weeds you find.
Rake the soil to a fine crumbly texture and make some drills 1cm deep. The rows should be spaced about 15cm apart. The spacing can depend on the type of crop, so make sure you check the seed packet.
If the soil is dry, water before sowing and allow the drill to drain.
Sprinkle seed in thinly along the drill (2cm apart) and cover with soil.
Flea beetles, slugs and snails might eat your radishes. You can offer protection by covering your crop with horticultural fleece.
Make sure you keep your crop well-watered, and harvest as needed.
Adapted from Royal Horticultural Society advice, www.rhs.org.uk