Repotting guide

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

Also called Zoys's Bellflower, Zoys Bellflower.

More about zoys's bellflower

About Zoys's Bellflower

Campanula zoysii · also called Zoys's Bellflower, Zoys Bellflower · flowering

Zoys's Bellflower is a rare, compact alpine bellflower from the limestone screes of the Julian Alps. It bears tubular, puckered-mouthed pale lavender-blue flowers in midsummer on cushion-forming plants just 5–8 cm tall. A specialist's plant, it demands perfect drainage and alpine house conditions in wetter climates.

Mature size: 5–8 cm tall, spreading 10–15 cm wide

Watch for — Crown and root rot: The primary cause of failure in cultivation. Caused by wet compost or moisture sitting on the crown. Grow in an alpine house, use extreme grit ratios, and water only at the base.

How to tell zoys's bellflower needs repotting

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

Every 2–3 years, into bone-dry mix. Zoys's Bellflower's growth habit — cushion-forming perennial alpine; tight rosettes of small, rounded leaves — sets the pace. Zoys's Bellflower is a rare, compact alpine bellflower from the limestone screes of the Julian Alps. It bears tubular, puckered-mouthed pale lavender-blue flowers in midsummer on cushion-forming plants just 5–8 cm tall. A specialist's plant, it demands perfect drainage and alpine house conditions in wetter climates.

What size pot to step zoys'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. Zoys'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 zoys's bellflower

Spring or summer, while zoys'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 zoys's bellflower

Repot dry. Do not water zoys'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 extremely gritty limestone alpine mix 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 zoys'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 zoys'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 zoys's bellflower

Zoys's Bellflower wants extremely gritty limestone alpine mix. Use one part loam to three parts coarse limestone grit or crushed limestone. Neutral to alkaline pH (7.0–7.5) is essential. Incorporate some tufa fragments if available. Never use peat-based composts. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting zoys's bellflower — frequently asked questions

How often should you repot zoys's bellflower?

Every 2–3 years, into bone-dry mix for zoys's bellflower. Repot zoys's bellflower every 2–3 years into a snug pot of extremely gritty limestone alpine mix, 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 zoys's bellflower need?

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

Should you water zoys's bellflower after repotting?

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

Not immediately. Wait about 3 weeks after repotting zoys'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.