Repotting guide

When & how to repot Sedum spectabile 'Iceberg' (Hylotelephium spectabile 'Iceberg')

Also called Iceberg stonecrop, Iceberg sedum.

More about sedum spectabile 'iceberg'

About Sedum spectabile 'Iceberg'

Hylotelephium spectabile 'Iceberg' · also called Iceberg stonecrop, Iceberg sedum · flowering

A white-flowered showy stonecrop with fresh light-green succulent leaves and flat corymbs of pure white star flowers in late summer and autumn. 'Iceberg' brings a cool, luminous note to sunny borders, draws bees and butterflies, and leaves pale dried seedheads for winter structure. Compact, drought-tolerant, and very low-maintenance.

Mature size: About 30-45 cm tall and 30-45 cm wide at maturity.

How to tell sedum spectabile 'iceberg' needs repotting

Repotting on a calendar is less reliable than reading the plant. For sedum spectabile 'iceberg', 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 sedum spectabile 'iceberg'

Every 2–3 years, into bone-dry mix. Sedum spectabile 'Iceberg''s growth habit — compact, upright clump-forming herbaceous perennial with pale succulent foliage and flat-topped white flower heads that age to tan seedheads. — sets the pace. A white-flowered showy stonecrop with fresh light-green succulent leaves and flat corymbs of pure white star flowers in late summer and autumn. 'Iceberg' brings a cool, luminous note to sunny borders, draws bees and butterflies, and leaves pale dried seedheads for winter structure. Compact, drought-tolerant, and very low-maintenance.

What size pot to step sedum spectabile 'iceberg' up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Sedum spectabile 'Iceberg' 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 sedum spectabile 'iceberg'

Spring or summer, while sedum spectabile 'iceberg' 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 sedum spectabile 'iceberg'

Repot dry. Do not water sedum spectabile 'iceberg' 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 lean, gritty, well-drained soil 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 sedum spectabile 'iceberg' 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 sedum spectabile 'iceberg' 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 sedum spectabile 'iceberg'

Sedum spectabile 'Iceberg' wants lean, gritty, well-drained soil. Best in poor to average free-draining soil with neutral to slightly alkaline pH. Avoid rich, moisture-retentive ground, which causes splaying; improve clay with grit. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting sedum spectabile 'iceberg' — frequently asked questions

How often should you repot sedum spectabile 'iceberg'?

Every 2–3 years, into bone-dry mix for sedum spectabile 'iceberg'. Repot sedum spectabile 'iceberg' every 2–3 years into a snug pot of lean, gritty, well-drained soil, 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 sedum spectabile 'iceberg' need?

When is the best time of year to repot sedum spectabile 'iceberg'?

Should you water sedum spectabile 'iceberg' after repotting?

No — not straight away. Repot sedum spectabile 'iceberg' 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 sedum spectabile 'iceberg' after repotting?

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