Fertilising guide
How to fertilise Annual Clary (Salvia viridis)— schedule & NPK
Also called Annual Clary, Clary, Painted Sage, Bluebeard.
More about annual clary
About Annual Clary
Salvia viridis · also called Annual Clary, Clary · flowering
Salvia viridis (syn. Salvia horminum) is a fast-growing annual native to the Mediterranean basin, prized for its showy papery bracts in pink, purple, or white rather than its small flowers. It thrives in full sun and poor to moderately fertile, sharply drained soils, making it an excellent choice for gravel gardens and cottage borders. The most important care fact is that rich, moist soil produces lush foliage at the expense of the colourful bracts for which it is grown. The plant is considered mildly toxic to pets due to volatile essential oils present in the Salvia genus.
Growth habit: Erect, branching hardy annual with oval, hairy leaves and whorled spikes topped by persistent papery bracts in pink, purple, or white.
What fertiliser annual clary actually wants — and why
Annual Clary 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 annual clary: 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 annual clary, 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 annual clary:
Little to no feeding required; if plants appear pale, a single application of a low-nitrogen liquid feed (e.g. tomato feed) in early summer is sufficient. Treat that as sparingly through the growing season 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 annual clary 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 annual clary
Half strength is the safe default for annual clary — 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 annual clary first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the annual clary watering schedule.
Signs you are over-feeding annual clary
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for annual clary:
- 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 annual clary
- 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 annual clary care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of annual clary 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 annual clary
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 annual clary — frequently asked questions
What fertiliser does annual clary 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. Annual Clary 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 annual clary?
Little to no feeding required; if plants appear pale, a single application of a low-nitrogen liquid feed (e.g. tomato feed) in early summer is sufficient. Little to no feeding required; if plants appear pale, a single application of a low-nitrogen liquid feed (e.g. tomato feed) in early summer is sufficient. Treat that as sparingly through the growing season 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 annual clary?
Half strength is the safe default for annual clary — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding annual clary 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 annual clary 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 annual clary?
Flush the pot of annual clary 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
- Annual Clary care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water annual clary — 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 pelargonium 'frank headley'
- How to fertilise pelargonium 'happy thought'
- How to fertilise pelargonium 'mrs pollock'
- All 10153 fertilising guides in the Growli library