Fertilising guide

How to fertilise Shining Cranesbill (Geranium lucidum)— schedule & NPK

Also called Shining Cranesbill, Shining Geranium.

More about shining cranesbill

About Shining Cranesbill

Geranium lucidum · also called Shining Cranesbill, Shining Geranium · flowering

Geranium lucidum is a dainty annual or biennial native to Europe, North Africa and western Asia, typically colonising limestone walls, rocky banks and hedgerows. It is distinctive for its glossy, red-tinged leaves and bright, brittle, fleshy stems that flush vivid crimson in autumn. It prefers well-drained, alkaline soils in sun or partial shade and is highly drought-tolerant. True Geranium cranesbills are not listed as toxic to pets by the ASPCA — this species is considered non-toxic to cats and dogs.

Growth habit: Erect to spreading annual or biennial forming compact branched clumps with notably glossy, palmately lobed leaves that turn scarlet in cool conditions.

What fertiliser shining cranesbill actually wants — and why

Shining Cranesbill 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 shining cranesbill: 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 shining cranesbill, 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 shining cranesbill:

None required. Plants growing in fertile soil produce fewer flowers and are less drought-resistant — deliberately lean conditions suit this species. In practice: no routine feeding at all for shining cranesbill — 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 shining cranesbill 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 shining cranesbill

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

Signs you are over-feeding shining cranesbill

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

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 shining cranesbill

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

Flushing and leaching the salts

If shining cranesbill 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 shining cranesbill

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 shining cranesbill.

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 shining cranesbill — frequently asked questions

What fertiliser does shining cranesbill 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. Shining Cranesbill 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 shining cranesbill?

None required. Plants growing in fertile soil produce fewer flowers and are less drought-resistant — deliberately lean conditions suit this species. None required. Plants growing in fertile soil produce fewer flowers and are less drought-resistant — deliberately lean conditions suit this species. In practice: no routine feeding at all for shining cranesbill — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for shining cranesbill?