Repotting guide

When & how to repot Tweedy's Lewisia (Lewisia tweedyi)

Also called Tweedy's Lewisia, Tweedy Lewisia.

More about tweedy's lewisia

About Tweedy's Lewisia

Lewisia tweedyi · also called Tweedy's Lewisia, Tweedy Lewisia · flowering

A large, spectacular Lewisia from alpine rocky slopes in the Cascade and Wenatchee mountains of Washington State, bearing big peach-to-apricot or pale pink flowers in spring. One of the most striking alpine plants, yet demanding: it requires perfect drainage, cool summers, a dry rest period, and protection from winter wet.

Mature size: 20–35 cm tall in flower, rosette 15–20 cm wide

Watch for — Heat intolerance: Dislikes hot, humid summers. In zones 7–8, provide afternoon shade and excellent ventilation. Cool roots with a grit mulch. Failure to establish is often caused by summer heat rather than winter cold.

How to tell tweedy's lewisia needs repotting

Repotting on a calendar is less reliable than reading the plant. For tweedy's 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 tweedy's lewisia

Every 2–3 years, into bone-dry mix. Tweedy's Lewisia's growth habit — large rosette-forming semi-evergreen perennial — sets the pace. A large, spectacular Lewisia from alpine rocky slopes in the Cascade and Wenatchee mountains of Washington State, bearing big peach-to-apricot or pale pink flowers in spring. One of the most striking alpine plants, yet demanding: it requires perfect drainage, cool summers, a dry rest period, and protection from winter wet.

What size pot to step tweedy's lewisia up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Tweedy's 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 tweedy's lewisia

Spring or summer, while tweedy's 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 tweedy's lewisia

Repot dry. Do not water tweedy's 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 sharply drained, humus-rich but gritty alpine mix 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 tweedy's 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 tweedy's 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 tweedy's lewisia

Tweedy's Lewisia wants very sharply drained, humus-rich but gritty alpine mix. Grow in a mix of equal parts coarse horticultural grit, loam, and leaf mould. Slightly acidic to neutral pH (5.5–6.8). In its natural habitat it grows in rocky, gravelly talus with excellent drainage. Standard peat-based composts will kill it. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting tweedy's lewisia — frequently asked questions

How often should you repot tweedy's lewisia?

Every 2–3 years, into bone-dry mix for tweedy's lewisia. Repot tweedy's lewisia every 2–3 years into a snug pot of very sharply drained, humus-rich but gritty alpine mix, 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 tweedy's lewisia need?

When is the best time of year to repot tweedy's lewisia?

Should you water tweedy's lewisia after repotting?

No — not straight away. Repot tweedy's 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 tweedy's lewisia after repotting?

Not immediately. Wait about 3 weeks after repotting tweedy's 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.