Lithops pseudotruncatella: a watering calendar with four seasons, not one
Living stones are not difficult; they are simply on a different calendar from every other plant on the shelf. Water them on a succulent schedule and they last one season. Learn the four-part cycle and they live for decades.
The four-part calendar
Stage one, late spring to midsummer: flowering is finished, the old leaves begin to wrinkle and the plant is drying out. Water sparingly, about every 30 days, and stop entirely when the top of the body flattens and a fissure line appears.
Stage two, midsummer: complete rest. No water at all for six to eight weeks. Stage three, late summer to autumn: the fissure opens, a new pair of leaves emerges and the old pair shrinks to a papery husk. Resume water when the new leaves are two thirds of their final size, about every 20–25 days. Stage four, winter: the new leaves are full, the plant is dormant and it receives no water from November to February, or until the old husk is completely dry.
Why winter watering kills them
During the leaf-change rest the plant has no active root tips; the old roots have partly withdrawn. Water applied at 10 °C and 60 % humidity in a closed room sits in the mix for two weeks and rots the body from the base, and the first visible sign is a soft, dark patch at the soil line — by then it is unrecoverable.
The check is physical: press the old husk between thumb and forefinger in January. If it is still leathery, the plant is still drawing on it and you must not water. Only when it is papery and detaches cleanly is the cycle finished.
Light that keeps the pattern flat and the colours true
25,000–45,000 lux keeps a Lithops flat-topped, with the window pattern sitting level with the surrounding tissue. Below 20,000 lux the body elongates and the top domes upward; above 55,000 lux the sides scorch, and the scorched area is where rot starts in the next wet cycle.
Outdoors, provide 30 % shade from 11:00 to 15:00 and keep the pot raised so it never receives splash from the ground. Indoors, 20 cm below a 60 W LED bar for 12 hours works well, with a fan moving air across the surface — Lithops in still air are far more prone to rot.
Reading the fissure as a growth record
The fissure between the two leaves is the plant's least deceptive indicator. A closed, tight fissure means the plant has adequate water and is not in leaf change. A fissure that is opening and showing pale new tissue inside means the new leaves are forming and water must be withheld until they are two thirds grown.
A plant with an open fissure and two visible old husks around it has skipped a cycle, usually because it was over-watered in the previous winter. Withhold water for a full year and it will usually resynchronise, but it may take two seasons to return to a normal rhythm.
Parameter table
- Latin name
- Lithops pseudotruncatella
- Common name
- Living stones
- Rosette form
- stacked
- Light range
- 25,000–45,000 lux
- Water interval
- 35 days at 24–28 °C
- Rest period
- Two rest periods: the summer heat rest and the winter leaf-change rest, which is when most are lost
- Hardiness
- 10–11 (protect below 3 °C)
- Offset behaviour
- Does not offset — it replaces itself, producing one or two new bodies inside the old one each year
- Soil mix (by volume)
- 4 pumice : 1 akadama : 1 loam, 2–4 mm, with a top dressing of 5 mm grit
- Mature diameter
- 4 cm
| Month | State | What the plant wants |
|---|---|---|
| January | Rest | Out of action for this genus — no water unless the plant visibly shrinks, and no repotting. |
| February | Rest | Out of action for this genus — no water unless the plant visibly shrinks, and no repotting. |
| March | Growth | Repotting window opens for summer growers. Trim roots, refresh the mineral fraction, dry for a week. |
| April | Growth | Growth restarts. First full watering at the rim, then resume the published interval. |
| May | Growth | Peak growth and the offset season. Feed at quarter strength every third watering. |
| June | Growth | Lengthening days, rising heat. Watch the leaf turgor test rather than the calendar. |
| July | Rest | Out of action for this genus — no water unless the plant visibly shrinks, and no repotting. |
| August | Rest | Out of action for this genus — no water unless the plant visibly shrinks, and no repotting. |
| September | Growth | Autumn window for winter growers. Root-prune and repot while the soil is still warm. |
| October | Growth | Peak autumn growth. This is the season when most colour work should be done. |
| November | Growth | Daylight falls fast. Taper watering by a quarter and stop feeding entirely. |
| December | Growth | Slow, dry and bright. This is the colour peak for most genera in the collection. |
Tinted rows are the months this genus is genuinely out of action: no repotting, no feeding, and water only if the plant visibly shrinks.
Four things to take away
- Four stages: dry-down, full summer rest, new-leaf growth, winter rest.
- No water at all for six to eight weeks in midsummer and again from November to February.
- Press the old husk in January — leathery means still active, papery means the cycle is done.
- 25,000–45,000 lux, 30 % midday shade outdoors, and moving air at all times.
Informational only — This page is a cultivation record, not horticultural or plant-pathology advice. Any treatment should follow the product label and local regulation.