Fertilising guide

How to fertilise Lemon Catnip (Nepeta cataria 'Citriodora')— schedule & NPK

Also called Lemon Catnip, Citron Catnip.

More about lemon catnip

About Lemon Catnip

Nepeta cataria 'Citriodora' · also called Lemon Catnip, Citron Catnip · herb

Lemon Catnip is a lemon-scented cultivar of common catnip that is less attractive to cats than the species. It thrives in full sun with well-drained soil and is drought-tolerant once established. Bees and butterflies love it. Cut back after flowering to encourage a second flush and prevent self-seeding.

Growth habit: Upright, mounding herbaceous perennial

Watch for — Floppy, sprawling stems: Caused by too much shade or over-fertilising with nitrogen. Move to full sun and cut back to 10 cm after the first flush to stimulate compact regrowth.

What fertiliser lemon catnip actually wants — and why

Lemon Catnip is a lean, aromatic herb — the essential-oil flavour you grow it for is strongest in poor soil, so feeding it actively makes it worse.

Little or nothing. If anything, a very weak balanced feed or a thin compost top-dress — never a rich nitrogen feed, which dilutes the aromatic oils and produces soft, bland, floppy growth.

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 lemon catnip: 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 lemon catnip, 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 lemon catnip:

Apply a balanced, low-nitrogen fertiliser (e.g. 5-10-10) once in early spring. Avoid high-nitrogen feeds, which produce soft, floppy stems susceptible to lodging and disease. In practice: a spring compost top-dress at most, and otherwise leave lemon catnip unfed — lean, sharp-draining soil is exactly what concentrates its flavour.

The dormant-season rule matters more than the exact interval: skip feeding entirely when lemon catnip 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 lemon catnip

As weak as it gets for lemon catnip, or none at all. The flavour-versus-growth trade-off runs the opposite way to leafy crops: restraint is the technique.

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

Signs you are over-feeding lemon catnip

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

Lush, soft, fast growth with noticeably weaker scent and flavour.
Floppy stems, sparse essential oils, and poor cold/wet hardiness.
Salt crust in containers and scorched leaf tips from over-feeding.

Signs you are under-feeding lemon catnip

Rare — these herbs thrive on lean soil.
Only on truly exhausted soil: pale, thin, very slow growth.
A short-lived, weak plant in a long-spent container.

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

Flushing and leaching the salts

Over-feeding is so unlikely with lemon catnip that flushing is rarely needed; if a container has had feed, a single plain-water flush and a switch to a leaner, grittier mix resets it.

Organic vs synthetic feeds for lemon catnip

Organic options

A thin spring mulch of garden compost or leaf-mould is the most these want. UK: a little garden compost; US: a light Espoma Garden-tone top-dress at most. Lean and gritty beats fed and rich every time.

Synthetic / liquid feeds

Generally none for lemon catnip. At absolute most, a very dilute balanced feed once or twice in a container; in the ground, nothing — synthetic feeds work directly against the flavour.

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 lemon catnip — frequently asked questions

What fertiliser does lemon catnip need?

Little or nothing. If anything, a very weak balanced feed or a thin compost top-dress — never a rich nitrogen feed, which dilutes the aromatic oils and produces soft, bland, floppy growth. Lemon Catnip is a lean, aromatic herb — the essential-oil flavour you grow it for is strongest in poor soil, so feeding it actively makes it worse.

How often should I feed lemon catnip?

Apply a balanced, low-nitrogen fertiliser (e.g. 5-10-10) once in early spring. Avoid high-nitrogen feeds, which produce soft, floppy stems susceptible to lodging and disease. Apply a balanced, low-nitrogen fertiliser (e.g. 5-10-10) once in early spring. Avoid high-nitrogen feeds, which produce soft, floppy stems susceptible to lodging and disease. In practice: a spring compost top-dress at most, and otherwise leave lemon catnip unfed — lean, sharp-draining soil is exactly what concentrates its flavour.

What strength of feed for lemon catnip?