Fertilising guide
How to fertilise Wood Sage (Teucrium scorodonia)— schedule & NPK
Also called Wood Sage, Woodland Germander, Sage-leaved Germander.
More about wood sage
About Wood Sage
Teucrium scorodonia · also called Wood Sage, Woodland Germander · herb
Wood sage is a rhizomatous, clump-forming herbaceous perennial native to dry, acidic woodland, heathland, and rocky slopes throughout western and central Europe. Despite its common name, it is not a true sage (Salvia) but belongs to Lamiaceae and has distinctive garlic-scented foliage when crushed. It tolerates poor, acid, free-draining soils in partial shade and is exceptionally low-maintenance once established. As with other Teucrium species it contains potentially hepatotoxic diterpenoids and should be treated as mildly-toxic to pets as a precaution.
Growth habit: Upright to spreading rhizomatous perennial forming loose clumps; spreads slowly by underground stems.
What fertiliser wood sage actually wants — and why
Wood Sage 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 wood sage: 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 wood sage, 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 wood sage:
No regular feeding required on typical garden soils; excess fertility suppresses the compact, floriferous habit characteristic of this plant. In practice: a spring compost top-dress at most, and otherwise leave wood sage 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 wood sage 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 wood sage
As weak as it gets for wood sage, 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 wood sage first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the wood sage watering schedule.
Signs you are over-feeding wood sage
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for wood sage:
- 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 wood sage
- 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 wood sage care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Over-feeding is so unlikely with wood sage 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 wood sage
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 wood sage. 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 wood sage — frequently asked questions
What fertiliser does wood sage 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. Wood Sage 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 wood sage?
No regular feeding required on typical garden soils; excess fertility suppresses the compact, floriferous habit characteristic of this plant. No regular feeding required on typical garden soils; excess fertility suppresses the compact, floriferous habit characteristic of this plant. In practice: a spring compost top-dress at most, and otherwise leave wood sage unfed — lean, sharp-draining soil is exactly what concentrates its flavour.
What strength of feed for wood sage?
As weak as it gets for wood sage, 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 wood sage 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 wood sage 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 wood sage?
Over-feeding is so unlikely with wood sage 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
- Wood Sage care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water wood sage — 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 betony
- How to fertilise greek sage
- How to fertilise sweet cicely
- All 10153 fertilising guides in the Growli library