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Repotting guide

When & how to repot Wild Radish (Raphanus raphanistrum subsp. sativus)

Also called Wild Radish, Jointed Charlock, White Charlock, Wild Kale.

More about wild radish

About Wild Radish

Raphanus raphanistrum subsp. sativus · also called Wild Radish, Jointed Charlock · edible

Wild radish is the weedy ancestor of cultivated radishes, widely foraged for its peppery young leaves, seedpods, and flowers. It is a fast-growing cool-season annual or biennial, highly adaptable to disturbed ground. Young foliage and immature green seedpods are edible raw or cooked; mature seeds can be pressed for oil.

Mature size: 30–90 cm (12–36 in) tall; taproot thin and woody at maturity

Watch for — 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.

How to tell wild radish needs repotting

Repotting on a calendar is less reliable than reading the plant. For wild radish, watch for these signs:

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot wild radish

Pot on seedlings as they grow; not a perennial repot. Wild Radishis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Erect annual or biennial with deeply lobed basal leaves, branching stems, and four-petalled white to pale yellow or purple-veined flowers; taproot smaller than cultivated types.

What size pot to step wild radish up to

Pot wild radish on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot wild radish

Pot wild radish on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting wild radish

  1. Pot on before it is root-bound. Check wild radish regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
  2. Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
  3. Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
  4. Pot into rich mix. Set it into fresh tolerates poor, disturbed, or sandy soils; prefers well-drained loam at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
  5. Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water wild radish in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for wild radish

Wild Radish wants tolerates poor, disturbed, or sandy soils; prefers well-drained loam. Highly adaptable — grows in clay, sandy, loamy, or gravelly soils at pH 5.5–7.5. Richer soils produce more palatable foliage. Does not require amendment but benefits from basic composting in cultivation. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting wild radish — frequently asked questions

How often should you repot wild radish?

Pot on seedlings as they grow; not a perennial repot for wild radish. Wild Radish is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into tolerates poor, disturbed, or sandy soils; prefers well-drained loam so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does wild radish need?

Pot wild radish on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot wild radish?

Pot wild radish on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Can you put wild radish straight into a much bigger pot?

No. Even a fast-growing wild radish should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise wild radish after repotting?

Not immediately. Wait about 1 week after repotting wild radish. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.

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