Fertilising guide

How to fertilise Pelargonium 'Mabel Grey' (Pelargonium 'Mabel Grey')— schedule & NPK

Also called Mabel Grey scented geranium, Lemon verbena pelargonium.

More about pelargonium 'mabel grey'

About Pelargonium 'Mabel Grey'

Pelargonium 'Mabel Grey' · also called Mabel Grey scented geranium, Lemon verbena pelargonium · herb

Pelargonium 'Mabel Grey' is regarded as having the strongest lemon scent of any scented-leaf pelargonium, with rough, deeply cut, sharply lemon-fragrant leaves and small mauve-pink flowers. An upright, vigorous tender perennial from cultivated parentage, it is grown for its intense citrus foliage used in cooking, teas and potpourri, and needs bright light with sharp drainage.

Growth habit: Upright and vigorous, becoming tall and somewhat open with age; rough, jagged, strongly aromatic leaves on sturdy stems.

Watch for — Weak scent in low light: Insufficient sun and overfeeding dilute the prized lemon fragrance. Maximise direct light and avoid heavy nitrogen feeds.

What fertiliser pelargonium 'mabel grey' actually wants — and why

Pelargonium 'Mabel Grey' 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 pelargonium 'mabel grey': 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 pelargonium 'mabel grey', 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 pelargonium 'mabel grey':

From spring to late summer feed every 2-3 weeks with a balanced liquid feed at half strength, shifting to high-potash if you want more flowers. High nitrogen produces soft growth and dilutes the lemon scent. Withhold feed in winter. 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 pelargonium 'mabel grey' 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 pelargonium 'mabel grey'

Half strength is a sensible default for pelargonium 'mabel grey' — 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 pelargonium 'mabel grey' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the pelargonium 'mabel grey' watering schedule.

Signs you are over-feeding pelargonium 'mabel grey'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for pelargonium 'mabel grey':

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 pelargonium 'mabel grey'

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 pelargonium 'mabel grey' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Pot-grown pelargonium 'mabel grey' 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 pelargonium 'mabel grey'

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 pelargonium 'mabel grey' — frequently asked questions

What fertiliser does pelargonium 'mabel grey' 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. Pelargonium 'Mabel Grey' 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 pelargonium 'mabel grey'?

From spring to late summer feed every 2-3 weeks with a balanced liquid feed at half strength, shifting to high-potash if you want more flowers. High nitrogen produces soft growth and dilutes the lemon scent. Withhold feed in winter. From spring to late summer feed every 2-3 weeks with a balanced liquid feed at half strength, shifting to high-potash if you want more flowers. High nitrogen produces soft growth and dilutes the lemon scent. Withhold feed in winter. 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 pelargonium 'mabel grey'?