As the name suggests, these vegetables grow underground, and some can stay there even when there is frost on the surface. Some of those mentioned are technically brassicas, but I treat them as root vegetables.
These small roots couldn’t be easier to grow and are excellent for containers.
Radish seed can be sown from early spring to late summer, and even, at a push, into early fall in warmer regions. Sow seed thinly in a container and cover with ½in (1cm) of compost or growing mix. In beds or in the ground, sow thinly in rows ½in (1cm) deep and 4in (10cm) apart.