Repotting guide

When & how to repot Greater Celandine (Chelidonium majus)

Also called Greater Celandine, Tetterwort, Swallowwort, Common Celandine.

More about greater celandine

About Greater Celandine

Chelidonium majus · also called Greater Celandine, Tetterwort · herb

Greater Celandine is a short-lived European perennial herb in the poppy family, bearing bright yellow four-petalled flowers over soft, glaucous, pinnately lobed foliage from spring through autumn. The plant exudes distinctive orange-yellow latex sap used in traditional herbalism. It naturalises readily in hedgerows, walls, and shaded borders across temperate regions.

Mature size: 30–90 cm tall (12–36 in), spreading 30–45 cm (12–18 in) by self-seeding

How to tell greater celandine needs repotting

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

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot greater celandine on before it becomes hard root-bound.

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 greater celandine

Pot on seedlings as they grow; not a perennial repot. Greater Celandineis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Short-lived, tap-rooted perennial or biennial; self-seeds prolifically to maintain a colony; semi-evergreen in mild climates.

What size pot to step greater celandine up to

Pot greater celandine 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 greater celandine

Pot greater celandine 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 greater celandine

Pot on before it is root-bound. Check greater celandine regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
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.
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.
Pot into rich mix. Set it into fresh well-draining, average to moderately fertile loam or sandy loam at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water greater celandine 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 greater celandine

Greater Celandine wants well-draining, average to moderately fertile loam or sandy loam. Tolerates a wide range of soils including disturbed ground, stony substrate, and old walls. Prefers neutral to slightly alkaline pH (6.5–8.0), reflecting its affinity for calcareous soils and lime-mortared walls. Does not require enriched soil; fertile conditions can encourage excessive leafy growth and self-seeding. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting greater celandine — frequently asked questions

How often should you repot greater celandine?

Pot on seedlings as they grow; not a perennial repot for greater celandine. Greater Celandine is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into well-draining, average to moderately fertile loam or sandy 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 greater celandine need?

When is the best time of year to repot greater celandine?

Can you put greater celandine straight into a much bigger pot?

No. Even a fast-growing greater celandine 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 greater celandine after repotting?

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