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Fertilising guide

How to fertilise Claw Sage (Salvia unguiculata)— schedule & NPK

Also called Claw Sage.

More about claw sage

About Claw Sage

Salvia unguiculata · also called Claw Sage · flowering

Salvia unguiculata is a tender perennial sage native to South America, producing vivid flowers on upright stems and valued by pollinators, particularly hummingbirds. It thrives in full sun with free-draining soil and is drought-tolerant once established. The most important care fact is that it is frost-tender and must be overwintered under cover or treated as an annual in cool-temperate climates. Salvia is listed as non-toxic to cats and dogs by the ASPCA.

Growth habit: Upright tender perennial herb with branching flower spikes.

What fertiliser claw sage actually wants — and why

Claw 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 claw 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 claw 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 claw sage:

Apply a balanced slow-release granular fertiliser in spring; avoid high-nitrogen feeds that promote leaf growth over flowers. 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 claw 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 claw sage

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

Signs you are over-feeding claw sage

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

Signs you are under-feeding claw sage

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

Flushing and leaching the salts

Flush the pot of claw 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 claw 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 claw sage — frequently asked questions

What fertiliser does claw 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. Claw 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 claw sage?

Apply a balanced slow-release granular fertiliser in spring; avoid high-nitrogen feeds that promote leaf growth over flowers. Apply a balanced slow-release granular fertiliser in spring; avoid high-nitrogen feeds that promote leaf growth over flowers. 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 claw sage?

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

What does over-feeding claw 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 claw 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 claw sage?

Flush the pot of claw 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.

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