Fertilising guide

How to fertilise Geranium himalayense (Geranium himalayense)— schedule & NPK

Also called Himalayan cranesbill, Lilac cranesbill.

More about geranium himalayense

About Geranium himalayense

Geranium himalayense · also called Himalayan cranesbill, Lilac cranesbill · flowering

Geranium himalayense is a hardy rhizomatous perennial cranesbill forming a low, spreading mat of deeply cut leaves. Large, saucer-shaped, violet-blue flowers with white eyes and fine veining appear in early summer, often reblooming in autumn. Tough, undemanding and self-supporting, it suits the front of borders and informal ground cover in sun or part shade.

Growth habit: Rhizomatous, mat-forming perennial that spreads steadily by underground rhizomes to make weed-suppressing ground cover; herbaceous, dying back in winter and reshooting in spring.

What fertiliser geranium himalayense actually wants — and why

Geranium himalayense 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 himalayense: 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 himalayense, 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 himalayense:

Undemanding. A spring mulch of garden compost or a single light application of balanced general fertiliser is plenty. Avoid high-nitrogen feeds, which promote floppy foliage at the expense of flowers. In practice: no routine feeding at all for geranium himalayense — 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 himalayense 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 himalayense

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

Signs you are over-feeding geranium himalayense

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

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 himalayense

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 himalayense care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

If geranium himalayense 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 himalayense

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 himalayense.

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 himalayense — frequently asked questions

What fertiliser does geranium himalayense 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 himalayense 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 himalayense?

Undemanding. A spring mulch of garden compost or a single light application of balanced general fertiliser is plenty. Avoid high-nitrogen feeds, which promote floppy foliage at the expense of flowers. Undemanding. A spring mulch of garden compost or a single light application of balanced general fertiliser is plenty. Avoid high-nitrogen feeds, which promote floppy foliage at the expense of flowers. In practice: no routine feeding at all for geranium himalayense — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for geranium himalayense?