Repotting guide

When & how to repot Zois's Bellflower (Campanula zoysii)

Also called Zois's bellflower, Crimped bellflower.

More about zois's bellflower

About Zois's Bellflower

Campanula zoysii · also called Zois's bellflower, Crimped bellflower · flowering

Campanula zoysii is a choice, semi-evergreen alpine perennial endemic to the southeastern Alps, where it grows in limestone rock crevices at subalpine and alpine elevations. It forms tight cushions of small, glossy, oval leaves and carries unusual tubular lavender-blue flowers whose mouths are distinctively pinched or crimped, flowering in summer for three to four weeks. It demands exceptionally sharp drainage and shelter from winter wet, making it better suited to an alpine trough or covered scree bed than an open border. Campanula species are considered non-toxic to cats and dogs by the ASPCA.

Mature size: 5–8 cm tall; 10–15 cm wide.

How to tell zois's bellflower needs repotting

Repotting on a calendar is less reliable than reading the plant. For zois's bellflower, 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 zois's bellflower

Every 2–3 years, into bone-dry mix. Zois's Bellflower's growth habit — tight cushion-forming, semi-evergreen perennial with a slowly spreading habit. — sets the pace. Campanula zoysii is a choice, semi-evergreen alpine perennial endemic to the southeastern Alps, where it grows in limestone rock crevices at subalpine and alpine elevations. It forms tight cushions of small, glossy, oval leaves and carries unusual tubular lavender-blue flowers whose mouths are distinctively pinched or crimped, flowering in summer for three to four weeks. It demands exceptionally sharp drainage and shelter from winter wet, making it better suited to an alpine trough or covered scree bed than an open border. Campanula species are considered non-toxic to cats and dogs by the ASPCA.

What size pot to step zois's bellflower up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Zois's Bellflower 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 zois's bellflower

Spring or summer, while zois's bellflower 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 zois's bellflower

Repot dry. Do not water zois's bellflower 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 very well-drained, alkaline to neutral; gritty limestone scree 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 zois's bellflower 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 zois's bellflower 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 zois's bellflower

Zois's Bellflower wants very well-drained, alkaline to neutral; gritty limestone scree. A mix of equal parts loam, coarse grit, and limestone chippings closely mimics its native habitat; avoid any peat-based or moisture-retentive compost. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting zois's bellflower — frequently asked questions

How often should you repot zois's bellflower?

Every 2–3 years, into bone-dry mix for zois's bellflower. Repot zois's bellflower every 2–3 years into a snug pot of very well-drained, alkaline to neutral; gritty limestone scree, 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 zois's bellflower need?

When is the best time of year to repot zois's bellflower?

Should you water zois's bellflower after repotting?

No — not straight away. Repot zois's bellflower 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 zois's bellflower after repotting?

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