Repotting guide

When & how to repot Franz's Living Stone (Lithops francisci)

Also called Franz's Pebble Plant, Living Stone.

More about franz's living stone

About Franz's Living Stone

Lithops francisci · also called Franz's Pebble Plant, Living Stone · houseplant

Lithops francisci is a distinctive South African living stone with compact, windowed leaf pairs marked with a complex pattern of dark lines and dots on a grey-brown surface. White flowers appear in late summer to autumn. Like all Lithops, it requires a strict leafless dry-rest period to prevent rot. Lithops are listed by the ASPCA as non-toxic to pets.

Mature size: 2-4 cm tall; individual leaf pairs 2-3 cm wide

Watch for — Root loss in dormancy: Normal: Lithops shed most roots in the rest period and regenerate them in spring. Do not attempt to compensate by watering.

How to tell franz's living stone needs repotting

Repotting on a calendar is less reliable than reading the plant. For franz's living stone, 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 franz's living stone

Every 2–3 years, into bone-dry mix. Franz's Living Stone's growth habit — compact solitary or clustering stemless succulent — sets the pace. Lithops francisci is a distinctive South African living stone with compact, windowed leaf pairs marked with a complex pattern of dark lines and dots on a grey-brown surface. White flowers appear in late summer to autumn. Like all Lithops, it requires a strict leafless dry-rest period to prevent rot. Lithops are listed by the ASPCA as non-toxic to pets.

What size pot to step franz's living stone up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Franz's Living Stone 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 franz's living stone

Spring or summer, while franz's living stone 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 franz's living stone

Repot dry. Do not water franz's living stone 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 cactus mix: 50% cactus compost and 50% coarse grit or perlite 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 franz's living stone 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 franz's living stone 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 franz's living stone

Franz's Living Stone wants gritty cactus mix: 50% cactus compost and 50% coarse grit or perlite. A highly mineral, fast-draining mix is mandatory. Organic-rich composts retain moisture that causes rot. Top-dress with fine gravel to reflect the rocky quartz substrate of the Northern Cape habitat. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting franz's living stone — frequently asked questions

How often should you repot franz's living stone?

Every 2–3 years, into bone-dry mix for franz's living stone. Repot franz's living stone every 2–3 years into a snug pot of gritty cactus mix: 50% cactus compost and 50% coarse grit or perlite, 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 franz's living stone need?

When is the best time of year to repot franz's living stone?

Should you water franz's living stone after repotting?

No — not straight away. Repot franz's living stone 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 franz's living stone after repotting?

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