Fertilising guide

How to fertilise Geranium phaeum 'Album' (Geranium phaeum 'Album')— schedule & NPK

Also called White dusky cranesbill, Album mourning widow.

More about geranium phaeum 'album'

About Geranium phaeum 'Album'

Geranium phaeum 'Album' · also called White dusky cranesbill, Album mourning widow · flowering

Geranium phaeum 'Album' is the pure-white form of the dusky cranesbill, lighting up shade with small, reflexed white flowers on slender stems above fresh green leaves in late spring and early summer. The white blooms glow in dim, woodland conditions where darker forms can disappear. It is a tough, shade- and dry-shade-tolerant perennial that naturalises gently beneath trees and shrubs.

Growth habit: Upright clump-forming perennial with a basal leaf rosette and airy flowering stems; spreads gently and self-seeds.

What fertiliser geranium phaeum 'album' actually wants — and why

Geranium phaeum 'Album' 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 geranium phaeum 'album': 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 geranium phaeum 'album', 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 geranium phaeum 'album':

Light feeder. An annual spring mulch of leaf mould or compost suffices; heavy feeding promotes lax foliage at the expense of flowers. In practice: no routine feeding at all for geranium phaeum 'album' — 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 geranium phaeum 'album' 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 geranium phaeum 'album'

None is the correct answer for geranium phaeum 'album'. 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 geranium phaeum 'album' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the geranium phaeum 'album' watering schedule.

Signs you are over-feeding geranium phaeum 'album'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for geranium phaeum 'album':

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 geranium phaeum 'album'

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 geranium phaeum 'album' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

If geranium phaeum 'album' 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 geranium phaeum 'album'

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 geranium phaeum 'album'.

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 geranium phaeum 'album' — frequently asked questions

What fertiliser does geranium phaeum 'album' 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. Geranium phaeum 'Album' 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 geranium phaeum 'album'?

Light feeder. An annual spring mulch of leaf mould or compost suffices; heavy feeding promotes lax foliage at the expense of flowers. Light feeder. An annual spring mulch of leaf mould or compost suffices; heavy feeding promotes lax foliage at the expense of flowers. In practice: no routine feeding at all for geranium phaeum 'album' — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for geranium phaeum 'album'?