Plant family

Radishes belong to the brassica family, also called the cole or mustard family, along with close relatives such as turnips, cabbage, broccoli, cauliflower, kale, kohlrabi, arugula, and mustard greens. All of these crops share the same major pests and diseases, so gardeners should treat them as one group when planning rotations.

Why rotate radishes

Growing radishes or other brassicas in the same ground year after year lets clubroot, a soilborne disease that can persist for many seasons, build up and deform the roots. Repeated planting also concentrates pests like flea beetles, cabbage root maggots, and cabbage aphids that overwinter near their host crops. Rotating breaks these pest and disease cycles and helps keep the bed productive.

What to plant after

Radishes do well after legumes such as peas or bush beans, which fix nitrogen and leave the soil in good condition for the leafy top growth of the crop that follows. They also fit nicely after heavy feeders like tomatoes or squash, since radishes are quick, light feeders that can use a bed between longer-season crops. A predecessor from a different plant family means fewer shared pests and diseases waiting in the soil.

What to avoid

Avoid planting radishes right before or after other brassicas such as turnips, cabbage, broccoli, cauliflower, kale, kohlrabi, arugula, or mustard greens. Because they share clubroot, flea beetles, and cabbage root maggots, following one brassica with another simply feeds the same problems and gives them no break. Try to wait at least two to three years before returning any brassica to the same spot.

Example rotation

A simple four-year, four-bed plan could run like this. Year one, plant legumes such as peas or beans; year two, plant radishes and other brassicas in that bed; year three, follow with a fruiting crop like tomatoes or peppers; and year four, grow roots such as carrots or beets. Each year every crop group shifts to the next bed, so radishes only come back to a given bed once every four years.

Tips

Keep a simple garden notebook or bed map so you can see where the brassica group grew each year and avoid repeating it too soon. Grouping all cabbage-family crops together in one bed makes them easy to move as a unit, and sowing a cover crop or legume in the off-season helps rebuild the soil before radishes return.

General guidance for US home gardens. Adapt to your own crops, soil, and space; your Cooperative Extension office can help with a plan for your area. Page updated Aug 4, 2026.