Repotting guide

When & how to repot Fringed Houseleek (Sempervivum ciliosum)

Also called Fringed Houseleek, Ciliated Houseleek, Teneriffe Houseleek.

More about fringed houseleek

About Fringed Houseleek

Sempervivum ciliosum · also called Fringed Houseleek, Ciliated Houseleek · flowering

Sempervivum ciliosum is a Bulgarian alpine succulent forming compact mats of small, grey-green rosettes densely covered in fine white hairs that give the foliage a frosted, fringed appearance. Native to rocky limestone slopes in Bulgaria and the Balkans, it thrives in full sun with sharply drained gritty soil and is extremely cold-hardy. The key care rule is never allow water to pool in or around the rosettes, especially in winter. Sempervivum is listed as non-toxic to cats and dogs by the ASPCA.

Mature size: Rosettes 5–8 cm wide; mats spread to 30–50 cm over time.

Watch for — Vine weevil larvae: Adult vine weevils notch the leaf edges of rosettes while larvae destroy the roots, causing plants to detach from the soil and die. Treat container plants with Steinernema kraussei nematodes in late summer; remove and inspect lifted plants.

How to tell fringed houseleek needs repotting

Repotting on a calendar is less reliable than reading the plant. For fringed houseleek, 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 fringed houseleek

Every 2–3 years, into bone-dry mix. Fringed Houseleek's growth habit — mat-forming, monocarpic succulent rosettes that spread by offsets (chicks) on short stolons. — sets the pace. Sempervivum ciliosum is a Bulgarian alpine succulent forming compact mats of small, grey-green rosettes densely covered in fine white hairs that give the foliage a frosted, fringed appearance. Native to rocky limestone slopes in Bulgaria and the Balkans, it thrives in full sun with sharply drained gritty soil and is extremely cold-hardy. The key care rule is never allow water to pool in or around the rosettes, especially in winter. Sempervivum is listed as non-toxic to cats and dogs by the ASPCA.

What size pot to step fringed houseleek up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Fringed Houseleek 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 fringed houseleek

Spring or summer, while fringed houseleek 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 fringed houseleek

Repot dry. Do not water fringed houseleek 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 sandy, very free-draining, slightly alkaline 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 fringed houseleek 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 fringed houseleek 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 fringed houseleek

Fringed Houseleek wants sandy, very free-draining, slightly alkaline. Use a 50/50 mix of horticultural grit and loam-based compost, or a proprietary cactus and succulent mix. Avoid any moisture-retentive additions such as peat. Excellent for troughs, scree beds, walls, and green roofs. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting fringed houseleek — frequently asked questions

How often should you repot fringed houseleek?

Every 2–3 years, into bone-dry mix for fringed houseleek. Repot fringed houseleek every 2–3 years into a snug pot of sandy, very free-draining, slightly alkaline, 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 fringed houseleek need?

When is the best time of year to repot fringed houseleek?

Should you water fringed houseleek after repotting?

No — not straight away. Repot fringed houseleek 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 fringed houseleek after repotting?

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