Repotting guide

When & how to repot Goldmoss Stonecrop (Sedum acre)

Also called Goldmoss Stonecrop, Wall Pepper, Mossy Stonecrop, Biting Stonecrop.

More about goldmoss stonecrop

About Goldmoss Stonecrop

Sedum acre · also called Goldmoss Stonecrop, Wall Pepper · flowering

Sedum acre is a vigorous, mat-forming stonecrop native to Europe, Asia, and North Africa, widely naturalised in North America. Its tiny, succulent, triangular leaves form a dense moss-like mat covered in a bright flush of star-shaped golden-yellow flowers in late spring and early summer. Extremely tough and drought-tolerant, it colonises walls, rock gardens, and alpine troughs.

Mature size: 3–5 cm (1–2 in) tall; spreading mat to 45–60 cm (18–24 in) or more wide

Watch for — Invasive spreading: Sedum acre can spread aggressively and is considered invasive in parts of North America. In garden beds, install root barriers or plant in contained troughs. Remove self-seeded patches promptly if you do not want it to colonise surrounding areas.

How to tell goldmoss stonecrop needs repotting

Repotting on a calendar is less reliable than reading the plant. For goldmoss stonecrop, 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 goldmoss stonecrop

Every 2–3 years, into bone-dry mix. Goldmoss Stonecrop's growth habit — mat-forming, carpeting perennial; dense, moss-like mats of tiny scale-like succulent leaves spreading by stems rooting at the nodes — sets the pace. Sedum acre is a vigorous, mat-forming stonecrop native to Europe, Asia, and North Africa, widely naturalised in North America. Its tiny, succulent, triangular leaves form a dense moss-like mat covered in a bright flush of star-shaped golden-yellow flowers in late spring and early summer. Extremely tough and drought-tolerant, it colonises walls, rock gardens, and alpine troughs.

What size pot to step goldmoss stonecrop up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Goldmoss Stonecrop 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 goldmoss stonecrop

Spring or summer, while goldmoss stonecrop 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 goldmoss stonecrop

Repot dry. Do not water goldmoss stonecrop 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 poor, sharply draining, thin soil or gritty 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 goldmoss stonecrop 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 goldmoss stonecrop 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 goldmoss stonecrop

Goldmoss Stonecrop wants poor, sharply draining, thin soil or gritty mix. Thrives in poor, lean, sandy, or gravelly soil where other plants struggle. Rich, fertile soils encourage sappy, sprawling growth at the expense of the tight mossy form and flower production. pH 6.0–8.0; tolerates alkaline conditions well. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting goldmoss stonecrop — frequently asked questions

How often should you repot goldmoss stonecrop?

Every 2–3 years, into bone-dry mix for goldmoss stonecrop. Repot goldmoss stonecrop every 2–3 years into a snug pot of poor, sharply draining, thin soil or gritty 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 goldmoss stonecrop need?

When is the best time of year to repot goldmoss stonecrop?

Should you water goldmoss stonecrop after repotting?

No — not straight away. Repot goldmoss stonecrop 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 goldmoss stonecrop after repotting?

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