Fertilising guide

How to fertilise Anise (Pimpinella anisum)— schedule & NPK

Also called Anise, Aniseed, Sweet Cumin.

More about anise

About Anise

Pimpinella anisum · also called Anise, Aniseed · herb

Anise is a slender annual herb in the carrot family, grown for its sweet, liquorice-flavoured seeds and feathery, aromatic foliage. It produces flat umbels of tiny white flowers that ripen to ribbed seeds used in baking, drinks and confectionery. A warm-season Mediterranean crop, it needs a long, sunny, frost-free season and light, well-drained soil to ripen seed.

Growth habit: Upright, slender, branching annual with delicate fern-like lower leaves and finer upper foliage, topped by umbels of white flowers that set seed; completes its life cycle in one season.

What fertiliser anise actually wants — and why

Anise 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 anise: 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 anise, 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 anise:

A moderate feeder; enrich soil with compost before sowing and, on poor ground, apply a light balanced feed early in growth. Avoid heavy nitrogen, which favours leafy growth and delays the seed ripening that anise is grown for. 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 anise 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 anise

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

Signs you are over-feeding anise

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

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 anise

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

Flushing and leaching the salts

Pot-grown anise 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 anise

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 anise — frequently asked questions

What fertiliser does anise 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. Anise 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 anise?

A moderate feeder; enrich soil with compost before sowing and, on poor ground, apply a light balanced feed early in growth. Avoid heavy nitrogen, which favours leafy growth and delays the seed ripening that anise is grown for. A moderate feeder; enrich soil with compost before sowing and, on poor ground, apply a light balanced feed early in growth. Avoid heavy nitrogen, which favours leafy growth and delays the seed ripening that anise is grown for. 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 anise?