Repotting guide

When & how to repot Rose campion (Lychnis coronaria)

Also called Rose campion, Dusty miller, Mullein pink.

More about rose campion

About Rose campion

Lychnis coronaria · also called Rose campion, Dusty miller · flowering

A biennial to short-lived perennial with vividly magenta-crimson (or white) flowers held above distinctive silver-white, woolly stems and leaves from early to midsummer. Thrives in full sun in poor, well-drained soil. Extremely drought-tolerant and self-seeds freely. Pet-safe. A classic cottage-garden plant that naturalises with minimal care.

Mature size: 60–90 cm tall, 45 cm wide

Watch for — Root and crown rot: The number-one killer. Wet, poorly draining soil — especially in winter — causes rapid rotting of the woolly crown. Ensure excellent drainage, particularly in clay soils, and avoid mulching directly over the crown.

How to tell rose campion needs repotting

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

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 rose campion

Every 2–3 years, into bone-dry mix. Rose campion's growth habit — upright biennial or short-lived perennial forming a basal rosette of silver-white, woolly, oblong leaves in the first year, then branched, silver-felted flowering stems in the second year bearing vivid magenta-pink or white flowers. — sets the pace. A biennial to short-lived perennial with vividly magenta-crimson (or white) flowers held above distinctive silver-white, woolly stems and leaves from early to midsummer. Thrives in full sun in poor, well-drained soil. Extremely drought-tolerant and self-seeds freely. Pet-safe. A classic cottage-garden plant that naturalises with minimal care.

What size pot to step rose campion up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Rose campion stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

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 rose campion

Spring or summer, while rose campion is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting rose campion

Repot dry. Do not water rose campion for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty poor to average, well-drained or dry soil ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set rose campion at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep rose campion completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for rose campion

Rose campion wants poor to average, well-drained or dry soil. Thrives in lean, infertile, gritty, or chalky soil with excellent drainage. Rich, moist soil produces lax, overly tall plants that may flop. pH 6.0–8.0 is acceptable. Sandy and gravelly soils suit it perfectly. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting rose campion — frequently asked questions

How often should you repot rose campion?

Every 2–3 years, into bone-dry mix for rose campion. Repot rose campion every 2–3 years into a snug pot of poor to average, well-drained or dry soil, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does rose campion need?

When is the best time of year to repot rose campion?

Should you water rose campion after repotting?

No — not straight away. Repot rose campion into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise rose campion after repotting?

Not immediately. Wait about 3 weeks after repotting rose campion. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.