Fertilising guide
How to fertilise Anise-scented Sage (Salvia guaranitica)— schedule & NPK
Also called Anise-scented Sage, Blue Anise Sage, Brazilian Sage.
More about anise-scented sage
About Anise-scented Sage
Salvia guaranitica · also called Anise-scented Sage, Blue Anise Sage · flowering
Anise-scented sage is a vigorous, tuberous-rooted subshrub native to South America (Brazil, Paraguay, Uruguay, and Argentina), prized for its deep cobalt-blue flowers held in near-black calyxes that bloom from late summer until hard frost. Brushing the wrinkled, hairy leaves releases a pleasant anise fragrance that gives the plant its common name. In the UK and cooler US zones it is grown as a half-hardy perennial — the tuberous roots can be lifted and stored like dahlias, or the whole plant overwintered in a frost-free space. The Salvia genus is listed as non-toxic to cats, dogs, and horses by the ASPCA.
Growth habit: Upright, branched subshrub with dark green wrinkled stems and hairy leaves; forms spreading clumps via tuberous roots.
What fertiliser anise-scented sage actually wants — and why
Anise-scented Sage is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
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-scented 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 anise-scented 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 anise-scented sage:
Apply a balanced slow-release fertiliser in spring; supplement with a monthly liquid feed through summer to sustain the long flowering period on this vigorous grower. Treat that as monthly between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when anise-scented 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 anise-scented sage
Half strength is the safe default for anise-scented sage — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water anise-scented sage first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the anise-scented sage watering schedule.
Signs you are over-feeding anise-scented sage
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for anise-scented sage:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding anise-scented sage
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full anise-scented sage care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of anise-scented sage with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for anise-scented sage
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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-scented sage — frequently asked questions
What fertiliser does anise-scented sage need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Anise-scented Sage is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed anise-scented sage?
Apply a balanced slow-release fertiliser in spring; supplement with a monthly liquid feed through summer to sustain the long flowering period on this vigorous grower. Apply a balanced slow-release fertiliser in spring; supplement with a monthly liquid feed through summer to sustain the long flowering period on this vigorous grower. Treat that as monthly between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for anise-scented sage?
Half strength is the safe default for anise-scented sage — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding anise-scented sage look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding anise-scented sage year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of anise-scented sage?
Flush the pot of anise-scented sage with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Anise-scented Sage care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water anise-scented 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 stoloniferous sundew
- How to fertilise climbing sundew
- How to fertilise rambling sundew
- All 10153 fertilising guides in the Growli library