Fertilising guide
How to fertilise Corsican Heron's Bill (Erodium corsicum)— schedule & NPK
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.
Growth habit: Low mounding to mat-forming evergreen perennial with fern-like, deeply lobed grey-green leaves.
What fertiliser corsican heron's bill actually wants — and why
Corsican Heron's Bill is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for corsican heron's bill: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed corsican heron's bill, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For corsican heron's bill:
Apply a low-nitrogen, high-potassium fertiliser (such as tomato feed) once in spring; avoid rich feeding, which promotes soft growth prone to rot. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when corsican heron's bill is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for corsican heron's bill
Half strength is the safe default for corsican heron's bill — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water corsican heron's bill first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the corsican heron's bill watering schedule.
Signs you are over-feeding corsican heron's bill
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for corsican heron's bill:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding corsican heron's bill
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full corsican heron's bill care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of corsican heron's bill with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for corsican heron's bill
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising corsican heron's bill — frequently asked questions
What fertiliser does corsican heron's bill need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Corsican Heron's Bill is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed corsican heron's bill?
Apply a low-nitrogen, high-potassium fertiliser (such as tomato feed) once in spring; avoid rich feeding, which promotes soft growth prone to rot. Apply a low-nitrogen, high-potassium fertiliser (such as tomato feed) once in spring; avoid rich feeding, which promotes soft growth prone to rot. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for corsican heron's bill?
Half strength is the safe default for corsican heron's bill — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding corsican heron's bill look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding corsican heron's bill year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of corsican heron's bill?
Flush the pot of corsican heron's bill with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Corsican Heron's Bill care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water corsican heron's bill — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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- How to fertilise sedum 'matrona'
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- All 10153 fertilising guides in the Growli library