Fertilising guide

How to fertilise Ivan Cranesbill (Geranium 'Ivan')— schedule & NPK

Also called Ivan Cranesbill, Hardy Geranium 'Ivan', Cranesbill 'Ivan'.

More about ivan cranesbill

About Ivan Cranesbill

Geranium 'Ivan' · also called Ivan Cranesbill, Hardy Geranium 'Ivan' · flowering

Geranium 'Ivan' is a tall, vigorous, mound-forming hardy cranesbill of garden origin, valued for its striking magenta-red flowers with dark veining and a near-black eye — similar in character to Geranium psilostemon but more spreading. It thrives in any moderately fertile, well-drained soil in full sun to partial shade, and is remarkably cold-hardy, tolerating temperatures well below -20 °C. The single most important care step is cutting back flowered stems after the main summer flush to encourage fresh foliage and a second wave of blooms. True Geranium (cranesbill) species are not listed as toxic by the ASPCA and are widely regarded as pet-safe; note that ASPCA's toxic 'Geranium' entry refers to Pelargonium, a separate genus.

Growth habit: Spreading, mound-forming herbaceous perennial that dies back to ground level in winter.

What fertiliser ivan cranesbill actually wants — and why

Ivan 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 ivan 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 ivan 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 ivan cranesbill:

Apply a balanced granular fertiliser (e.g. 10-10-10) in early spring as new growth emerges; avoid high-nitrogen feeds that promote leafy growth at the expense of flowers. In practice: no routine feeding at all for ivan 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 ivan 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 ivan cranesbill

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

Signs you are over-feeding ivan cranesbill

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for ivan 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 ivan 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 ivan cranesbill care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

If ivan 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 ivan 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 ivan 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 ivan cranesbill — frequently asked questions

What fertiliser does ivan 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. Ivan 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 ivan cranesbill?

Apply a balanced granular fertiliser (e.g. 10-10-10) in early spring as new growth emerges; avoid high-nitrogen feeds that promote leafy growth at the expense of flowers. Apply a balanced granular fertiliser (e.g. 10-10-10) in early spring as new growth emerges; avoid high-nitrogen feeds that promote leafy growth at the expense of flowers. In practice: no routine feeding at all for ivan cranesbill — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for ivan cranesbill?