Repotting guide

When & how to repot Karas Mountains Living Stones (Lithops karasmontana)

Also called Karasberg Living Stones, Stone Plant, Mimicry Plant.

More about karas mountains living stones

About Karas Mountains Living Stones

Lithops karasmontana · also called Karasberg Living Stones, Stone Plant · houseplant

Lithops karasmontana is a remarkable stone-mimicking succulent from Namibia's Karas Mountains, forming pairs of fused, pebble-like leaves with intricate grey-brown patterns. It produces white or pale yellow flowers in autumn. Strict watering discipline is critical — overwatering during the wrong season kills it. The ASPCA has previously listed Lithops as non-toxic to dogs and cats.

Mature size: 2–4 cm tall; individual bodies 1.5–3 cm wide; clumps spread over years

How to tell karas mountains living stones needs repotting

Repotting on a calendar is less reliable than reading the plant. For karas mountains living stones, 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 karas mountains living stones

Every 2–3 years, into bone-dry mix. Karas Mountains Living Stones's growth habit — stemless, body-forming succulent; solitary or clumping slowly — sets the pace. Lithops karasmontana is a remarkable stone-mimicking succulent from Namibia's Karas Mountains, forming pairs of fused, pebble-like leaves with intricate grey-brown patterns. It produces white or pale yellow flowers in autumn. Strict watering discipline is critical — overwatering during the wrong season kills it. The ASPCA has previously listed Lithops as non-toxic to dogs and cats.

What size pot to step karas mountains living stones up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Karas Mountains Living Stones 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 karas mountains living stones

Spring or summer, while karas mountains living stones 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 karas mountains living stones

Repot dry. Do not water karas mountains living stones 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 ultra-gritty, mineral-based succulent mix (80% inorganic: coarse sand, fine pumice, grit; 20% compost) 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 karas mountains living stones 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 karas mountains living stones 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 karas mountains living stones

Karas Mountains Living Stones wants ultra-gritty, mineral-based succulent mix (80% inorganic: coarse sand, fine pumice, grit; 20% compost). Replicates the near-pure quartz gravel of Namibian desert floors. Pure cactus compost retains too much moisture. Small, deep pots (to accommodate the taproot) with maximum drainage are essential. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting karas mountains living stones — frequently asked questions

How often should you repot karas mountains living stones?

Every 2–3 years, into bone-dry mix for karas mountains living stones. Repot karas mountains living stones every 2–3 years into a snug pot of ultra-gritty, mineral-based succulent mix (80% inorganic: coarse sand, fine pumice, grit; 20% compost), 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 karas mountains living stones need?

When is the best time of year to repot karas mountains living stones?

Should you water karas mountains living stones after repotting?

No — not straight away. Repot karas mountains living stones 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 karas mountains living stones after repotting?

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