Repotting guide

When & how to repot Short-Sepalled Lewisia (Lewisia brachycalyx)

Also called Short-Sepalled Lewisia, Short-Sepal Bitterroot.

More about short-sepalled lewisia

About Short-Sepalled Lewisia

Lewisia brachycalyx · also called Short-Sepalled Lewisia, Short-Sepal Bitterroot · flowering

Native to moist mountain meadows and subalpine grasslands in Arizona, New Mexico, Utah, and Baja California, Lewisia brachycalyx is a deciduous alpine perennial that forms a flat rosette of narrow, fleshy leaves and produces large, showy white or pale pink flowers in early spring before going completely dormant by midsummer. It holds the RHS Award of Garden Merit and is regarded as one of the showiest deciduous lewisias for the rock garden. The essential care rule is to keep the taproot bone-dry throughout the summer dormancy period, as moisture during this period invariably causes fatal rot. Lewisia is not listed by the ASPCA; classified mildly-toxic as a precaution.

Mature size: 5–10 cm tall in flower, 10–15 cm wide

How to tell short-sepalled lewisia needs repotting

Repotting on a calendar is less reliable than reading the plant. For short-sepalled lewisia, 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 short-sepalled lewisia

Every 2–3 years, into bone-dry mix. Short-Sepalled Lewisia's growth habit — deciduous, low-growing rosette perennial arising from a short, thick taproot and caudex; entirely dormant from midsummer to early autumn. — sets the pace. Native to moist mountain meadows and subalpine grasslands in Arizona, New Mexico, Utah, and Baja California, Lewisia brachycalyx is a deciduous alpine perennial that forms a flat rosette of narrow, fleshy leaves and produces large, showy white or pale pink flowers in early spring before going completely dormant by midsummer. It holds the RHS Award of Garden Merit and is regarded as one of the showiest deciduous lewisias for the rock garden. The essential care rule is to keep the taproot bone-dry throughout the summer dormancy period, as moisture during this period invariably causes fatal rot. Lewisia is not listed by the ASPCA; classified mildly-toxic as a precaution.

What size pot to step short-sepalled lewisia up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Short-Sepalled Lewisia 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 short-sepalled lewisia

Spring or summer, while short-sepalled lewisia 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 short-sepalled lewisia

Repot dry. Do not water short-sepalled lewisia 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 very well-drained gritty loam, moist in winter/spring, neutral to acid (ph 6.0–7.0) 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 short-sepalled lewisia 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 short-sepalled lewisia 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 short-sepalled lewisia

Short-Sepalled Lewisia wants very well-drained gritty loam, moist in winter/spring, neutral to acid (ph 6.0–7.0). Use a 1:1 mix of sharp grit and lean loam or a specialist alpine compost. Plant the crown slightly proud of the soil surface and apply a 2–3 cm grit collar. Avoid peat-based mixes that retain moisture in summer. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting short-sepalled lewisia — frequently asked questions

How often should you repot short-sepalled lewisia?

Every 2–3 years, into bone-dry mix for short-sepalled lewisia. Repot short-sepalled lewisia every 2–3 years into a snug pot of very well-drained gritty loam, moist in winter/spring, neutral to acid (ph 6.0–7.0), 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 short-sepalled lewisia need?

When is the best time of year to repot short-sepalled lewisia?

Should you water short-sepalled lewisia after repotting?

No — not straight away. Repot short-sepalled lewisia 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 short-sepalled lewisia after repotting?

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