Repotting guide

When & how to repot Coral Bells 'Palace Purple' (Heuchera micrantha 'Palace Purple')

Also called Coral bells, Alumroot.

More about coral bells 'palace purple'

About Coral Bells 'Palace Purple'

Heuchera micrantha 'Palace Purple' · also called Coral bells, Alumroot · flowering

'Palace Purple' is a classic coral bells grown chiefly for its bronze-purple, maple-shaped evergreen foliage, topped in summer by airy sprays of tiny cream flowers. A clump-forming, mound-shaped perennial, it suits borders, edging, and containers. Reliably hardy and pet-safe, it performs best in part shade with rich, well-drained soil that never waterlogs.

Mature size: 30-45 cm tall in flower and 30-45 cm wide

Watch for — Crown heaving: Shallow roots push the crown out of the ground over winter freeze-thaw cycles, exposing it. Re-firm or replant slightly deeper in spring and mulch to insulate.

How to tell coral bells 'palace purple' needs repotting

Repotting on a calendar is less reliable than reading the plant. For coral bells 'palace purple', watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for coral bells 'palace purple') flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

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 coral bells 'palace purple'

Only every 2–4 years, when genuinely crowded. Coral Bells 'Palace Purple' is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Low, dense, clump-forming evergreen perennial forming a neat mound of palmate leaves, with slender flowering stems rising well above the foliage in summer..

What size pot to step coral bells 'palace purple' up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Coral Bells 'Palace Purple' positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping coral bells 'palace purple' into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

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 coral bells 'palace purple'

Early spring, just as new growth restarts, is the ideal window for coral bells 'palace purple'. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting coral bells 'palace purple'

Confirm it actually needs it. Slide coral bells 'palace purple' out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip coral bells 'palace purple' out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh fertile, humus-rich, moist but sharply well-drained soil, slightly acidic to neutral, ph 6.0-7.0, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water coral bells 'palace purple' again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for coral bells 'palace purple'

Coral Bells 'Palace Purple' wants fertile, humus-rich, moist but sharply well-drained soil, slightly acidic to neutral, ph 6.0-7.0. Heucheras demand excellent drainage and rot in heavy wet ground. Improve clay with grit and compost. Plant with the crown at soil level, as shallow crowns are prone to heaving out of the ground in winter frosts. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting coral bells 'palace purple' — frequently asked questions

How often should you repot coral bells 'palace purple'?

Only every 2–4 years, when genuinely crowded for coral bells 'palace purple'. Only repot coral bells 'palace purple' every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using fertile, humus-rich, moist but sharply well-drained soil, slightly acidic to neutral, ph 6.0-7.0. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does coral bells 'palace purple' need?

When is the best time of year to repot coral bells 'palace purple'?

Does coral bells 'palace purple' like to be root-bound?

Yes — coral bells 'palace purple' genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise coral bells 'palace purple' after repotting?

Not immediately. Wait about 4 weeks after repotting coral bells 'palace purple'. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.