Repotting guide

When & how to repot Pachyphytum werdermannii (Pachyphytum werdermannii)

Also called Werdermann's moonstones.

More about pachyphytum werdermannii

About Pachyphytum werdermannii

Pachyphytum werdermannii · also called Werdermann's moonstones · houseplant

Pachyphytum werdermannii, Werdermann's moonstones, is a Mexican succulent with large, plump, rounded blue-grey leaves heavily veiled in chalky white farina, often flushing lilac-pink in strong light. It forms a loose rosette that trails with age. A classic desert succulent, it needs bright sun, very gritty soil, and sparing soak-and-dry watering.

Mature size: Rosettes reach about 10-12 cm (4-5 in) across; stems trail to roughly 15-25 cm over time, suiting it to shallow bowls or hanging displays.

Watch for — Farina damage: The thick white bloom marks permanently when touched. Handle by the pot or stem, never by the leaf surface.

How to tell pachyphytum werdermannii needs repotting

Repotting on a calendar is less reliable than reading the plant. For pachyphytum werdermannii, 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 pachyphytum werdermannii

Every 2–3 years, into bone-dry mix. Pachyphytum werdermannii's growth habit — slow-growing rosette that lengthens its stem with age and tends to trail or sprawl, offsetting into small clusters of fat-leaved rosettes. — sets the pace. Pachyphytum werdermannii, Werdermann's moonstones, is a Mexican succulent with large, plump, rounded blue-grey leaves heavily veiled in chalky white farina, often flushing lilac-pink in strong light. It forms a loose rosette that trails with age. A classic desert succulent, it needs bright sun, very gritty soil, and sparing soak-and-dry watering.

What size pot to step pachyphytum werdermannii up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Pachyphytum werdermannii 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 pachyphytum werdermannii

Spring or summer, while pachyphytum werdermannii 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 pachyphytum werdermannii

Repot dry. Do not water pachyphytum werdermannii 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 mineral-rich, sharply draining succulent 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 pachyphytum werdermannii 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 pachyphytum werdermannii 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 pachyphytum werdermannii

Pachyphytum werdermannii wants mineral-rich, sharply draining succulent mix. Combine cactus mix with 50% or more pumice, perlite, or coarse grit. The chunky, water-storing leaves demand excellent drainage and an unglazed pot to dry the root zone fast. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting pachyphytum werdermannii — frequently asked questions

How often should you repot pachyphytum werdermannii?

Every 2–3 years, into bone-dry mix for pachyphytum werdermannii. Repot pachyphytum werdermannii every 2–3 years into a snug pot of mineral-rich, sharply draining succulent 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 pachyphytum werdermannii need?

When is the best time of year to repot pachyphytum werdermannii?

Should you water pachyphytum werdermannii after repotting?

No — not straight away. Repot pachyphytum werdermannii 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 pachyphytum werdermannii after repotting?

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