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Fertilising guide

How to fertilise Autumn Catchfly (Silene schafta)— schedule & NPK

Also called Autumn Catchfly, Schafta Campion.

More about autumn catchfly

About Autumn Catchfly

Silene schafta · also called Autumn Catchfly, Schafta Campion · flowering

Autumn Catchfly is a compact, clump-forming perennial from the Caucasus, prized for producing its vivid magenta-pink flowers from late summer well into autumn when most alpines have finished. It forms low tufts of hairy, mid-green leaves and is excellent for rock gardens, front-of-border positions, and alpine troughs where late-season colour is valuable.

Growth habit: Clump-forming, semi-evergreen perennial with erect to semi-prostrate branching stems

What fertiliser autumn catchfly actually wants — and why

Autumn Catchfly 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 autumn catchfly: 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 autumn catchfly, 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 autumn catchfly:

Apply a balanced granular fertiliser at half the recommended rate in early spring. A second light feeding in midsummer extends the autumn flowering display. Avoid high-nitrogen feeds; they promote foliage at the expense of the notable late 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 autumn catchfly 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 autumn catchfly

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

Signs you are over-feeding autumn catchfly

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

Signs you are under-feeding autumn catchfly

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

Flushing and leaching the salts

Flush the pot of autumn catchfly 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 autumn catchfly

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 autumn catchfly — frequently asked questions

What fertiliser does autumn catchfly 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. Autumn Catchfly 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 autumn catchfly?

Apply a balanced granular fertiliser at half the recommended rate in early spring. A second light feeding in midsummer extends the autumn flowering display. Avoid high-nitrogen feeds; they promote foliage at the expense of the notable late flowers. Apply a balanced granular fertiliser at half the recommended rate in early spring. A second light feeding in midsummer extends the autumn flowering display. Avoid high-nitrogen feeds; they promote foliage at the expense of the notable late 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 autumn catchfly?

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

What does over-feeding autumn catchfly 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 autumn catchfly 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 autumn catchfly?

Flush the pot of autumn catchfly 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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