Repotting guide

When & how to repot Marble Houseleek (Sempervivum marmoreum)

Also called Marble Houseleek, Marbled Houseleek.

More about marble houseleek

About Marble Houseleek

Sempervivum marmoreum · also called Marble Houseleek, Marbled Houseleek · houseplant

Sempervivum marmoreum is a striking alpine succulent from the Balkans and Carpathians, named for its marbled green-and-red leaf colouring. It forms symmetrical, medium-sized rosettes that offset freely to create dense mats. Exceptionally frost-hardy and drought-tolerant, it thrives in gritty, sun-drenched positions and asks for very little beyond good drainage.

Mature size: Rosettes 5–8 cm wide; colonies spread to 30 cm or more

Watch for — Vine weevil (outdoors): Vine weevil grubs eat roots, causing rosettes to collapse suddenly. Inspect roots when re-potting and apply a biological nematode control (Steinernema kraussei) in late summer.

How to tell marble houseleek needs repotting

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

Every 2–3 years, into bone-dry mix. Marble Houseleek's growth habit — mat-forming, rosette succulent; spreads via numerous offsets on short stolons to form dense, ground-hugging colonies. — sets the pace. Sempervivum marmoreum is a striking alpine succulent from the Balkans and Carpathians, named for its marbled green-and-red leaf colouring. It forms symmetrical, medium-sized rosettes that offset freely to create dense mats. Exceptionally frost-hardy and drought-tolerant, it thrives in gritty, sun-drenched positions and asks for very little beyond good drainage.

What size pot to step marble houseleek up to

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

Spring or summer, while marble 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 marble houseleek

Repot dry. Do not water marble 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 gritty, sharply draining succulent or 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 marble 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 marble 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 marble houseleek

Marble Houseleek wants gritty, sharply draining succulent or alpine mix. A 50/50 blend of loam-based compost and horticultural grit or perlite is ideal. Good drainage prevents the crown rot to which this species is susceptible in wet conditions. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting marble houseleek — frequently asked questions

How often should you repot marble houseleek?

Every 2–3 years, into bone-dry mix for marble houseleek. Repot marble houseleek every 2–3 years into a snug pot of gritty, sharply draining succulent or 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 marble houseleek need?

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

Should you water marble houseleek after repotting?

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

Not immediately. Wait about 3 weeks after repotting marble 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.