Ornamental · Montiaceae
Lewisia
Lewisia cotyledon
Give it sharp drainage and a dry crown, and lewisia crowns its rosette with bright flowers each spring.
Partial sun
Every 7–14 days
USDA 4–8
6–12 in · 15–30 cm
Overview
Lewisia is an evergreen rock-garden plant from the mountains of western North America, where it roots in gravelly crevices on cool, well-drained slopes. It forms a tidy rosette of thick, fleshy leaves, then sends up airy sprays of flowers in late spring. Those blooms come in warm shades of pink, apricot, orange, and yellow, often with fine candy stripes running through the petals.
The whole plant is built for life on a rocky ledge. The fleshy leaves store water through dry spells, and the deep root anchors it in thin, gritty ground that would starve a fussier plant. That same design is why it hates wet feet. Lewisia wants the sharp drainage of its native scree, not the rich, damp bed most flowers enjoy.
Grow it in a trough, a raised rock garden, or sideways in a wall crevice, and it rewards you for years. It is hardy and long-lived, shrugging off hard winters down to its rated zones, yet it asks for a careful hand with water. Get the drainage right and the rest is easy.
Care
The short version: plant lewisia in gritty, sharply drained soil with the crown sitting high and dry, give it bright light with afternoon shade where summers are hot, and water at the base only when the top of the soil has dried.
Light
Lewisia does best in bright light with afternoon shade, especially where summers run hot. It will take full sun in cooler climates and tolerate part shade, but baking afternoon sun on a hot site scorches the rosette.
Water
Water at the base only, and never into the center of the rosette, since standing water there rots the crown fast. Let the top of the soil dry between drinks, which usually works out to every 7 to 14 days, and ease right off during summer dormancy.
Soil
Plant in gritty, sharply drained soil built from gravel and sand, the kind that mimics a mountain scree. A pH from 5.5 to 7.0 suits it, and the one thing it will not forgive is heavy, wet ground that holds water around the roots.
Temperature
Lewisia is tough, riding out cold down to -4°F (-20°C) and handling warmth up to about 75°F (24°C). Heat beyond that is the real risk, so give it cool roots and afternoon shade in a hot summer.
Humidity
This is a low-humidity plant at heart, happy in dry mountain air. Damp, stagnant conditions invite rot, so airflow around the crown matters far more than any moisture in the air.
Feeding
Feed lightly in spring and early summer with a dilute, low-nitrogen balanced fertilizer. Rich feeding pushes soft, sappy growth that rots easily, so go sparing rather than generous.
Pruning
Cut the spent flower stems off once the blooms fade, and pull away any withered outer leaves to keep rot from getting a foothold. No hard pruning is needed; this is light tidying, not a real cutback.
Repotting
Repot every 2 to 3 years, or sooner if the rosette crowds its pot, working in early spring into fresh gritty mix. Set the crown at or just above the soil line, and watch for roots out the drainage holes or weaker flowering as your cue.
Size & spacing
Expect a compact plant 6 to 12 inches (15 to 30 cm) tall and about 8 to 12 inches (20 to 30 cm) across. Its small, slow-growing size makes it a natural for troughs, crevices, and the front edge of a rock garden.
When to plant
Lewisia is a hardy perennial for zones 4 through 8 that settles in for the long haul rather than running on a yearly clock. Set young plants out in spring once the ground is workable, and look for the rosette to throw up its flowers from late spring into early summer.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Harvest: Late spring to early summer
Hardiness
USDA hardiness zones: 4–8
Temperature: down to -34°C
Troubleshooting
Almost every problem with lewisia traces back to one thing: water in the wrong place. Watch the crown and the new growth, since that is where trouble shows first. Catch it early and you can usually turn things around.
The rosette flops and the crown turns brown and mushy
This is crown rot, and it sets in when water sits in the center of the rosette or the soil stays wet. Once the neck goes soft and starts to smell, that plant rarely recovers. Water only at the base, work grit and a gravel collar around the crown, and lift the plant onto a slope if the ground holds moisture.
Fix:
- Stop overhead watering and water only at the base
- Improve drainage by adding grit and a gravel collar
- Lift and replant on a slope or crevice if soil stays wet
- Remove badly rotted plants to prevent spread
Sticky, curled new growth dotted with tiny insects
Those clustered soft-bodied insects on the new leaves and flower stems are aphids, and the sticky film they leave behind is honeydew. Knock them off with a gentle stream of water at the base, then reach for insecticidal soap if they keep coming back. Ladybirds will hunt them down if you let the predators move in.
Fix:
- Rinse off with a gentle stream of water at the base
- Apply insecticidal soap if persistent
- Encourage natural predators such as ladybirds
Toxicity
Good news for households with pets and children: lewisia is not toxic. The genus has a long history as food, and the related bitterroot was dug and eaten for generations, so a stray nibble is nothing to fear. The worst a curious pet might get is a mild stomach upset from eating too much of any plant.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Safe to be around. A curious nibble won't poison a cat, though any plant can upset a sensitive stomach if eaten in quantity.
Dogs None
No toxins to worry about here. A dog that chews a leaf or digs at the crown may get a mild tummy upset, but nothing dangerous.
Horses Safe
Grazing horses have nothing to fear from lewisia, which carries no compounds known to harm them.
Rabbits Safe
Rabbits can browse the fleshy leaves without harm, though they may strip a young rosette faster than it can recover.
Livestock Safe
Cattle, goats, and sheep can encounter it on the rock garden with no risk of poisoning.
Birds Safe
Garden birds and backyard poultry come to no harm pecking at the foliage or seed.
People Safe
The genus has a long history as food, with the related bitterroot root dug and eaten for generations, so there's no toxicity to fear.
Varieties
Most garden lewisias are forms of Lewisia cotyledon, sold as seed strains or named hybrids. A few are worth seeking out by name.
Sunset Group / Sunset Strain
A seed strain that throws warm flower colors across a wide range, from orange and apricot through pink and yellow.
'Elise'
A compact F1 hybrid that flowers fast from seed and keeps reblooming through the season.
var. heckneri
A natural variety set apart by the toothed, wavy edges along its rosette leaves.
How to propagate
You can raise more lewisia from seed or split off the small rosettes the plant makes for itself. Neither route is quick, but both are dependable if you keep the mix gritty and the moisture light.
SeedModerate
Sow fresh seed in autumn or late winter; benefits from cold stratification · 1-2 years to flowering size
Surface sow fresh seed on a gritty mix in autumn or late winter and keep it cool, since a cold spell wakes the seed up and lifts germination. Be patient once the seedlings appear, because they take 1 to 2 years to reach flowering size.
Offsets & pupsModerate
Spring or early summer once side rosettes form · Several weeks to root, full establishment in one season
Once side rosettes form in spring or early summer, twist off an offset with a sliver of the crown attached and let the cut surface dry for a few hours. Root it in barely moist gritty mix, where it takes hold within a few weeks and settles in fully over a single season.
Myths
Lewisia is a desert succulent that wants hot, dry, baking conditions.
It does have fleshy leaves and demands sharp drainage, which is where the confusion starts. But this is an alpine rock-crevice plant that wants cool roots and some afternoon shade where summers run hot. Bake it in dry heat and it sulks or dies rather than thriving.