Fertilising guide

How to fertilise Rose-Scented Geranium (Pelargonium graveolens)— schedule & NPK

Also called Rose Geranium, Rose-Scented Geranium, Sweet-Scented Geranium.

More about rose-scented geranium

About Rose-Scented Geranium

Pelargonium graveolens · also called Rose Geranium, Rose-Scented Geranium · herb

Rose-Scented Geranium is a tender South African pelargonium grown for deeply lobed leaves that release a strong rose fragrance when brushed, used for essential oil, flavouring and potpourri. A sun-loving evergreen subshrub, it wants bright light and well-drained soil, tolerates some drought, and must be protected from frost.

Growth habit: Bushy, branching evergreen subshrub with soft, deeply cut aromatic leaves and small pink flowers, growing upright and spreading with age.

What fertiliser rose-scented geranium actually wants — and why

Rose-Scented Geranium is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.

A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed.

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 rose-scented geranium: 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 rose-scented geranium, 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 rose-scented geranium:

Feed every 2-4 weeks in the growing season with a balanced or slightly potassium-rich fertiliser. Ease off in autumn and stop over winter; over-feeding gives lush leaves at the expense of fragrance. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.

The dormant-season rule matters more than the exact interval: skip feeding entirely when rose-scented geranium 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 rose-scented geranium

Half strength is a sensible default for rose-scented geranium — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.

Feeding always goes onto already-damp soil, never dry roots — water rose-scented geranium first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the rose-scented geranium watering schedule.

Signs you are over-feeding rose-scented geranium

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

Fast, soft, pale growth with diluted, less aromatic flavour.
Early bolting (running to flower) and a bitter edge.
Salt crust and scorched tips on container plants.

Signs you are under-feeding rose-scented geranium

Pale, slow regrowth after cutting and small leaves.
A tired, stalled plant that cannot keep up with harvesting.
Yellowing older leaves in a long-spent pot.

If the symptoms point at watering, light or roots rather than nutrition, the full rose-scented geranium care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Pot-grown rose-scented geranium builds up feed salts quickly — water until it drains each time and flush the pot with plain water every few weeks, especially on a sunny windowsill.

Organic vs synthetic feeds for rose-scented geranium

Organic options

A diluted seaweed feed or worm-casting tea keeps soft growth coming without overdoing it. UK: dilute seaweed or Westland; US: Espoma Garden-tone or Neptune's Harvest. Gentle, hard to overdo, flavour-friendly.

Synthetic / liquid feeds

A balanced liquid feed at half strength through harvesting — UK: Phostrogen, Baby Bio or Westland; US: Miracle-Gro all-purpose at half strength. Fast regrowth; just do not overdo the nitrogen.

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 rose-scented geranium — frequently asked questions

What fertiliser does rose-scented geranium need?

A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed. Rose-Scented Geranium is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.

How often should I feed rose-scented geranium?

Feed every 2-4 weeks in the growing season with a balanced or slightly potassium-rich fertiliser. Ease off in autumn and stop over winter; over-feeding gives lush leaves at the expense of fragrance. Feed every 2-4 weeks in the growing season with a balanced or slightly potassium-rich fertiliser. Ease off in autumn and stop over winter; over-feeding gives lush leaves at the expense of fragrance. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.

What strength of feed for rose-scented geranium?