Troubleshooting
Wild Radish problems — and how to fix them
Wild Radish (Raphanus raphanistrum subsp. sativus) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Invasive spreading
Wild radish self-seeds prolifically and is classified as a weed or invasive species in many regions. Deadhead before pods mature to prevent unwanted spread in garden beds or farmland.
Clubroot (Plasmodiophora brassicae)
As a brassica-family plant, wild radish is susceptible to clubroot in acidic, wet soils. Raise soil pH to 7.0–7.2 with lime, improve drainage, and rotate away from brassicas for at least four years.
Aphid colonies
Cabbage aphids and other brassica aphids colonise stems and leaf undersides. Knock off with a strong water jet, introduce beneficial insects such as ladybirds, or use an insecticidal soap spray.
Prevent wild radish problems before they start
Most wild radish issues are care-mismatch, not bad luck. Dial in the basics:
Looking for wild radish in general rather than its problems? Read the full wild radish care guide — light, water, soil and feeding.
Wild Radish problems — FAQ
Why is my wild radish invasive spreading?
Wild radish self-seeds prolifically and is classified as a weed or invasive species in many regions. Deadhead before pods mature to prevent unwanted spread in garden beds or farmland.
Why is my wild radish clubroot (plasmodiophora brassicae)?
As a brassica-family plant, wild radish is susceptible to clubroot in acidic, wet soils. Raise soil pH to 7.0–7.2 with lime, improve drainage, and rotate away from brassicas for at least four years.
Why is my wild radish aphid colonies?
Cabbage aphids and other brassica aphids colonise stems and leaf undersides. Knock off with a strong water jet, introduce beneficial insects such as ladybirds, or use an insecticidal soap spray.