Repotting guide

When & how to repot Campanula portenschlagiana (Campanula portenschlagiana)

Also called wall bellflower, Dalmatian bellflower.

More about campanula portenschlagiana

About Campanula portenschlagiana

Campanula portenschlagiana · also called wall bellflower, Dalmatian bellflower · flowering

Campanula portenschlagiana is a tough, mat-forming alpine perennial that smothers walls, troughs and crevices with violet-blue, star-shaped bells from early summer into autumn. It thrives in sun or part shade, tolerates poor, gritty soil and is reliably hardy. Vigorous but seldom invasive, it is ideal for edging, rockeries and dry-stone walls.

Mature size: 10-15 cm tall, spreading 30-50 cm or more.

How to tell campanula portenschlagiana needs repotting

Repotting on a calendar is less reliable than reading the plant. For campanula portenschlagiana, 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 campanula portenschlagiana

Every 2–3 years, into bone-dry mix. Campanula portenschlagiana's growth habit — low, dense, spreading evergreen mat that creeps by rooting stems and cascades attractively over walls and container edges. — sets the pace. Campanula portenschlagiana is a tough, mat-forming alpine perennial that smothers walls, troughs and crevices with violet-blue, star-shaped bells from early summer into autumn. It thrives in sun or part shade, tolerates poor, gritty soil and is reliably hardy. Vigorous but seldom invasive, it is ideal for edging, rockeries and dry-stone walls.

What size pot to step campanula portenschlagiana up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Campanula portenschlagiana 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 campanula portenschlagiana

Spring or summer, while campanula portenschlagiana 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 campanula portenschlagiana

Repot dry. Do not water campanula portenschlagiana 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 free-draining, gritty neutral to alkaline 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 campanula portenschlagiana 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 campanula portenschlagiana 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 campanula portenschlagiana

Campanula portenschlagiana wants free-draining, gritty neutral to alkaline soil. Happiest in poor to moderately fertile, sharply drained soil, including gritty or chalky mixes. Excellent for crevices and gravel. Add grit to heavy clay to prevent winter wet sitting at the crown. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting campanula portenschlagiana — frequently asked questions

How often should you repot campanula portenschlagiana?

Every 2–3 years, into bone-dry mix for campanula portenschlagiana. Repot campanula portenschlagiana every 2–3 years into a snug pot of free-draining, gritty neutral to alkaline 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 campanula portenschlagiana need?

When is the best time of year to repot campanula portenschlagiana?

Should you water campanula portenschlagiana after repotting?

No — not straight away. Repot campanula portenschlagiana 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 campanula portenschlagiana after repotting?

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