Lithops gracilidelineata
| Light | Very bright light; several hours of direct sun, more shade in the fiercest summer heat |
|---|---|
| Water | Very sparingly; water only in active growth (autumn and spring), keep bone-dry during leaf renewal and midsummer |
| Soil | Extremely gritty, mostly mineral mix (see Soil and potting mix) |
| Temperature | Keep above freezing; USDA zones 10–11 |
| Propagation | Seed (primary); occasionally division of clumps |
| Toxicity | Non-toxic to cats and dogs |
Lithops gracilidelineata is a chunky Namibian living stone whose flat-topped bodies mimic the weathered pebbles among which it grows. Its broad, pale grey to buff faces are etched with a network of fine, sharply drawn grey-brown lines, and in autumn it produces bright yellow daisy-like flowers. The species name — roughly "finely lined" — refers to those delicate surface markings, which are its most recognisable trait.
Description
Lithops gracilidelineata is one of the larger, more robust living stones. Each plant body consists of a pair of fused, semi-succulent leaves with a deep fissure across the top, forming a single flat-topped "head" typically 2–4 cm across. Older plants divide to form small clumps of several heads.
The upper faces are broad, flat and firm, coloured in muted shades of grey, cream and buff that vary with the light and the mineral it is grown in. Across each face runs a distinctive pattern of fine, dark grey-brown lines — sometimes a branching network, sometimes bolder channels — set into a slightly translucent or "windowed" surface that lets light reach the photosynthetic tissue below. This flattened, angular shape and the etched top give the plant its excellent camouflage among desert gravel.
Solitary yellow flowers appear from the fissure in autumn, opening in the afternoon over several days and often covering much of the body. Like other Lithops, the plant runs on a strict annual cycle: as the old pair of leaves shrivels, a fresh pair emerges from within to replace it.
Distribution and habitat
The species is native to Namibia, where it grows on exposed quartz gravel and rocky ground in an arid, winter-cool, summer-hot climate. Plants sit almost flush with the ground among stones of a similar colour, receiving very little rainfall from brief seasonal showers.
In habitat the flat top is often the only part visible, the rest of the body drawn down into the gritty soil for protection from heat and grazing. As with all cacti and many succulents traded internationally, wild collection is discouraged; nursery-grown seedlings are widely available and are the responsible choice.
Cultivation
Lithops gracilidelineata is a rewarding but discipline-testing plant, and — as with all living stones — overwatering is by far the commonest cause of death. Grow it in a deep, narrow pot filled with an extremely free-draining, mostly mineral mix, and give it the brightest position you can, with several hours of direct sun. Too little light causes the body to swell and elongate, losing its characteristic flat, low profile.
The single most important skill is watering to the plant's cycle rather than the calendar. Water sparingly during active growth in autumn and again in spring, always letting the mix dry completely in between. Withhold water almost entirely through midsummer dormancy and, crucially, during the winter-to-spring leaf renewal — watering while the new leaves are drawing moisture from the old pair leads to bloated, split, or rotting bodies. See Watering and Repotting for general technique.
Propagation
Seed is the standard and most reliable method. Sow the fine seed on the surface of a gritty, mineral mix, keep it warm and lightly humid until germination, then gradually harden the seedlings to stronger light; young Lithops are grown on for a year or more before they take on adult markings. Established clumps can also be divided, though the species is slow and division is less common. See Propagation — seed and Propagation — offsets for fuller guidance.
Common problems
- Rot — nearly always from watering at the wrong time (dormancy or leaf renewal) or from a mix that holds too much moisture; the body goes soft and mushy.
- Etiolation — insufficient light makes the body tall, pale and rounded instead of low and flat.
- Failure to renew cleanly — watering during the winter leaf change can cause the plant to stack extra leaf pairs or split unattractively.
- Pests — mealybugs (white fluff in the fissure and around the roots) and, less often, root mealybugs and spider mites; see Pests and diseases.
See also
- Lithops — the genus overview
- Soil and potting mix · Watering · Repotting · Propagation — seed · Propagation — offsets