Fertilising guide

How to fertilise Alpine Heron's Bill (Erodium reichardii)— schedule & NPK

Also called Alpine Heron's Bill, Alpine Geranium, Cranesbill.

More about alpine heron's bill

About Alpine Heron's Bill

Erodium reichardii · also called Alpine Heron's Bill, Alpine Geranium · flowering

Erodium reichardii is a miniature, mat-forming alpine perennial native to rocky limestone slopes in the Balearic Islands and Pyrenees. It bears a long succession of dainty white or pale pink veined flowers from late spring through summer and demands gritty, sharply drained, near-neutral to alkaline soil in a sunny, sheltered position. The single most important care rule is excellent drainage year-round, especially in winter. The genus is not listed as toxic by the ASPCA and is considered low-risk to pets.

Growth habit: Dense, mat-forming evergreen perennial producing compact cushions of tufted, dark green, scallop-edged leaves.

What fertiliser alpine heron's bill actually wants — and why

Alpine Heron's Bill flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency.

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 alpine 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 alpine 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 alpine heron's bill:

Top-dress with a granular low-nitrogen fertiliser in spring; avoid high-nitrogen feeds that produce lush foliage at the expense of flowers. In practice: no routine feeding at all for alpine heron's bill — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

The dormant-season rule matters more than the exact interval: skip feeding entirely when alpine 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 alpine heron's bill

None is the correct answer for alpine heron's bill. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.

Feeding always goes onto already-damp soil, never dry roots — water alpine 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 alpine heron's bill watering schedule.

Signs you are over-feeding alpine heron's bill

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for alpine heron's bill:

Abundant leafy growth and very few flowers (the classic over-rich symptom).
Soft, floppy stems and a sprawling, leafy habit.
Scorched edges and salt crust if it has been fed in a container.

Signs you are under-feeding alpine heron's bill

Effectively never an issue — these plants flower on poverty.
Only on genuinely dead soil: weak, thin growth and few blooms.
A short-lived plant in completely spent container compost.

If the symptoms point at watering, light or roots rather than nutrition, the full alpine heron's bill care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

If alpine heron's bill has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.

Organic vs synthetic feeds for alpine heron's bill

Organic options

A thin compost mulch for soil structure is the absolute most; mostly, give it nothing. UK/US: leave it lean — no manure, no liquid feed. Poor soil is the active ingredient here.

Synthetic / liquid feeds

None. Synthetic feeds, particularly anything with appreciable nitrogen, directly suppress flowering in alpine heron's bill.

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 alpine heron's bill — frequently asked questions

What fertiliser does alpine heron's bill need?

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency. Alpine Heron's Bill flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

How often should I feed alpine heron's bill?

Top-dress with a granular low-nitrogen fertiliser in spring; avoid high-nitrogen feeds that produce lush foliage at the expense of flowers. Top-dress with a granular low-nitrogen fertiliser in spring; avoid high-nitrogen feeds that produce lush foliage at the expense of flowers. In practice: no routine feeding at all for alpine heron's bill — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for alpine heron's bill?