Fertilising guide
How to fertilise Silver Tansy (Tanacetum niveum)— schedule & NPK
Also called Silver Tansy, Niveum Tansy, Snow Tansy.
More about silver tansy
About Silver Tansy
Tanacetum niveum · also called Silver Tansy, Niveum Tansy · flowering
Silver Tansy is a graceful perennial from Turkey and the eastern Mediterranean, forming spreading mounds of intensely silver-white, finely cut aromatic foliage smothered in late spring with masses of small white daisy flowers with yellow centres. Its striking silver foliage provides year-round textural contrast and is highly deer-resistant. It thrives in hot, dry, well-drained positions.
Growth habit: Spreading, mat- or mound-forming perennial; woody at base with a spreading crown of silver ferny foliage
Watch for — Flopping / open habit: Over-rich soil or too much shade causes stems to spread excessively and flop. Cut back hard after flowering to encourage a compact mound; reduce or eliminate feeding and ensure full sun.
What fertiliser silver tansy actually wants — and why
Silver Tansy 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 silver tansy: 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 silver tansy, 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 silver tansy:
Rarely needed. A very light balanced granular feed in early spring on very poor soils is the maximum required. Rich feeding produces lax, disease-prone growth that destroys the ornamental quality. 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 silver tansy 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 silver tansy
Half strength is the safe default for silver tansy — 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 silver tansy first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the silver tansy watering schedule.
Signs you are over-feeding silver tansy
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for silver tansy:
- 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 silver tansy
- 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 silver tansy care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of silver tansy 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 silver tansy
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 silver tansy — frequently asked questions
What fertiliser does silver tansy 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. Silver Tansy 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 silver tansy?
Rarely needed. A very light balanced granular feed in early spring on very poor soils is the maximum required. Rich feeding produces lax, disease-prone growth that destroys the ornamental quality. Rarely needed. A very light balanced granular feed in early spring on very poor soils is the maximum required. Rich feeding produces lax, disease-prone growth that destroys the ornamental quality. 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 silver tansy?
Half strength is the safe default for silver tansy — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding silver tansy 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 silver tansy 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 silver tansy?
Flush the pot of silver tansy 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
- Silver Tansy care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water silver tansy — 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 smooth phlox
- How to fertilise mountain phlox
- How to fertilise cleft phlox
- All 8452 fertilising guides in the Growli library