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Fertilising guide

How to fertilise Salvia yangii (Salvia yangii)— schedule & NPK

Also called Russian sage, Perovskia.

More about salvia yangii

About Salvia yangii

Salvia yangii · also called Russian sage, Perovskia · flowering

Russian sage, recently reclassified from Perovskia to Salvia yangii, is a woody-based subshrub with silvery, finely cut aromatic foliage and an airy haze of lavender-blue flowers in late summer. Tough and drought-proof, it thrives in hot, dry, sunny sites with sharp drainage and is invaluable for late-season colour and pollinators.

Growth habit: Upright, woody-based deciduous subshrub with silvery-white stems and a loose, airy, see-through flowering haze.

What fertiliser salvia yangii actually wants — and why

Salvia yangii 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 salvia yangii: 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 salvia yangii, 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 salvia yangii:

Needs little to no feeding; it performs best in lean soil. An occasional light spring compost topdress is ample, and over-feeding causes weak, floppy stems. 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 salvia yangii 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 salvia yangii

Half strength is the safe default for salvia yangii — 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 salvia yangii first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the salvia yangii watering schedule.

Signs you are over-feeding salvia yangii

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

Signs you are under-feeding salvia yangii

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

Flushing and leaching the salts

Flush the pot of salvia yangii 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 salvia yangii

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 salvia yangii — frequently asked questions

What fertiliser does salvia yangii 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. Salvia yangii 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 salvia yangii?

Needs little to no feeding; it performs best in lean soil. An occasional light spring compost topdress is ample, and over-feeding causes weak, floppy stems. Needs little to no feeding; it performs best in lean soil. An occasional light spring compost topdress is ample, and over-feeding causes weak, floppy stems. 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 salvia yangii?

Half strength is the safe default for salvia yangii — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding salvia yangii 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 salvia yangii 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 salvia yangii?

Flush the pot of salvia yangii 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.

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