Fertilising guide
How to fertilise French Tarragon (Artemisia dracunculus 'Sativa')— schedule & NPK
Also called True Tarragon, Estragon.
More about french tarragon
About French Tarragon
Artemisia dracunculus 'Sativa' · also called True Tarragon, Estragon · herb
French Tarragon is the prized culinary tarragon, a bushy perennial with narrow aromatic leaves carrying a distinctive sweet aniseed flavour essential to French cooking and béarnaise sauce. Unlike Russian tarragon, it rarely flowers or sets viable seed, so it is propagated vegetatively. It needs full sun, sharp drainage, and lean soil, resenting wet feet.
Growth habit: Bushy, woody-based herbaceous perennial with upright slender stems and narrow glossy leaves, dying back in winter and regrowing from the crown. French tarragon rarely flowers and produces no viable seed, spreading slowly by creeping roots.
What fertiliser french tarragon actually wants — and why
French Tarragon 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 french tarragon: 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 french tarragon, 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 french tarragon:
A light feeder that prefers lean conditions. Apply a single light feed of balanced fertiliser or compost in spring; over-feeding produces soft, floppy growth with diluted aniseed flavour. Container plants benefit from a half-strength liquid feed a few times in the growing season. In practice: a spring compost top-dress at most, and otherwise leave french tarragon 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 french tarragon 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 french tarragon
As weak as it gets for french tarragon, 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 french tarragon first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the french tarragon watering schedule.
Signs you are over-feeding french tarragon
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for french tarragon:
- 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 french tarragon
- 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 french tarragon care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Over-feeding is so unlikely with french tarragon 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 french tarragon
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 french tarragon. 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 french tarragon — frequently asked questions
What fertiliser does french tarragon 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. French Tarragon 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 french tarragon?
A light feeder that prefers lean conditions. Apply a single light feed of balanced fertiliser or compost in spring; over-feeding produces soft, floppy growth with diluted aniseed flavour. Container plants benefit from a half-strength liquid feed a few times in the growing season. A light feeder that prefers lean conditions. Apply a single light feed of balanced fertiliser or compost in spring; over-feeding produces soft, floppy growth with diluted aniseed flavour. Container plants benefit from a half-strength liquid feed a few times in the growing season. In practice: a spring compost top-dress at most, and otherwise leave french tarragon unfed — lean, sharp-draining soil is exactly what concentrates its flavour.
What strength of feed for french tarragon?
As weak as it gets for french tarragon, or none at all. The flavour-versus-growth trade-off runs the opposite way to leafy crops: restraint is the technique.
What does over-feeding french tarragon look like?
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. Feeding french tarragon like a leafy vegetable is the defining mistake — rich nitrogen gives you a big, soft, fast plant whose leaves are watery and bland, with weak winter-rot resistance.
Should I flush the soil of french tarragon?
Over-feeding is so unlikely with french tarragon 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.
Keep reading
- French Tarragon care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water french tarragon — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise basil
- How to fertilise herb garden
- How to fertilise mint
- All 1284 fertilising guides in the Growli library