Repotting guide

When & how to repot Corsican Heron's Bill (Erodium corsicum)

Also called Corsican Heron's Bill, Corsican Stork's Bill.

More about corsican heron's bill

About Corsican Heron's Bill

Erodium corsicum · also called Corsican Heron's Bill, Corsican Stork's Bill · flowering

Erodium corsicum is a compact evergreen perennial native to rocky, sun-baked slopes in Corsica and Sardinia. It thrives in sharply drained, alkaline to neutral soil in full sun and is an excellent candidate for rock gardens, troughs, and dry stone walls. The most important care point is to keep roots consistently dry in winter, as waterlogging rather than frost is the primary cause of death. It is not listed on the ASPCA toxic plant database and the genus is generally considered low-risk to pets.

Mature size: 10–15 cm tall, 20–30 cm spread.

Watch for — Vine weevil: Larvae eat roots undetected until plants collapse; use nematode biocontrol (Steinernema kraussei) in autumn and avoid mulching with organic material near the crown.

How to tell corsican heron's bill needs repotting

Repotting on a calendar is less reliable than reading the plant. For corsican heron's bill, watch for these signs:

Roots creeping out of the drainage holes or matting tightly across the soil surface.
The rootball dries out within a day or two no matter how much you water.
Water channels straight down the gap between rootball and pot without wetting the centre.
Steady decline — thin growth, persistent crispy edges — that good humidity and watering have not fixed. Only then is the disturbance of a repot worth the risk for corsican heron's bill.

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 corsican heron's bill

Every 1–2 years, disturbing the roots as little as possible. Corsican Heron's Bill's growth habit — low mounding to mat-forming evergreen perennial with fern-like, deeply lobed grey-green leaves. — sets the pace. Erodium corsicum is a compact evergreen perennial native to rocky, sun-baked slopes in Corsica and Sardinia. It thrives in sharply drained, alkaline to neutral soil in full sun and is an excellent candidate for rock gardens, troughs, and dry stone walls. The most important care point is to keep roots consistently dry in winter, as waterlogging rather than frost is the primary cause of death. It is not listed on the ASPCA toxic plant database and the genus is generally considered low-risk to pets.

What size pot to step corsican heron's bill up to

Go up only one size and handle the rootball as little as possible. Corsican Heron's Bill resents root disturbance, so the goal is to slide the intact rootball into slightly more soil — not to tease, wash or prune the roots. A modest step up means less shock and a faster recovery.

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 corsican heron's bill

Early spring, just as new growth restarts, is the ideal window for corsican heron's bill. 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 corsican heron's bill

Keep disturbance to a minimum. Corsican Heron's Bill resents root disturbance, so the plan is to move the intact rootball — not to wash, tease or prune the roots.
Choose just one size up. Pick a pot only one size larger with drainage, and have moisture-retentive well-drained gritty or sandy loam, alkaline to neutral ready.
Slide the rootball out whole. Water the day before, then ease corsican heron's bill out keeping the rootball intact. Gently free only the roots that are circling the very bottom.
Nestle it into fresh soil. Add a base layer of fresh mix, set the rootball in at the same depth, and backfill gently around the sides without packing hard.
Water and protect. Water in, then keep it warm, humid and out of direct sun for a few weeks while it re-roots. Expect a short sulk — that is normal.

Aftercare

Expect corsican heron's bill to sulk for a couple of weeks — that is normal after any root disturbance for this group. Keep it warm, humid and out of direct sun, water just enough to keep the mix lightly moist, and do not panic and overwater while it re-roots. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for corsican heron's bill

Corsican Heron's Bill wants well-drained gritty or sandy loam, alkaline to neutral. Add horticultural grit generously at planting; a raised bed or alpine trough with a grit mulch around the crown keeps moisture away from the stem base. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting corsican heron's bill — frequently asked questions

How often should you repot corsican heron's bill?

Every 1–2 years, disturbing the roots as little as possible for corsican heron's bill. Repot corsican heron's bill every 1–2 years, disturbing the roots as little as possible — it sulks for weeks if the rootball is teased apart. Slide it into one size up in spring with fresh well-drained gritty or sandy loam, alkaline to neutral, keep it warm and humid afterwards, and never bare-root or hard-prune the roots.

What size pot does corsican heron's bill need?

When is the best time of year to repot corsican heron's bill?

Why does corsican heron's bill sulk after repotting?

Corsican Heron's Bill resents root disturbance, so a wilt or stall for a week or two after repotting is normal, not a failure. Minimise it by keeping the rootball intact, stepping up just one size, and keeping the plant warm, humid and out of direct sun while it re-roots.

Should you fertilise corsican heron's bill after repotting?

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