Radishes grow well in most soils, but prefer rich, moist free draining soils. Sow seeds at regular intervals from March-August into well cultivated soil. Sow seeds very thinly 1cm (0.5in) deep in drills 15cm (6in) apart.
Thin out seedlings to 3-5cm (1-2in) apart. Water during dry spells.
For summer sowings choose a moist cool spot to prevent running to seed. As radishes grow so fast and use less of the soil goodness, use them totally as a catch crop with other slower-maturing produce. Harvest as soon as the roots reach reasonable size, if left too long they will become hot and woody.