Fertilising guide
How to fertilise Rose campion (Lychnis coronaria)— schedule & NPK
Also called Rose campion, Dusty miller, Mullein pink.
More about rose campion
About Rose campion
Lychnis coronaria · also called Rose campion, Dusty miller · flowering
A biennial to short-lived perennial with vividly magenta-crimson (or white) flowers held above distinctive silver-white, woolly stems and leaves from early to midsummer. Thrives in full sun in poor, well-drained soil. Extremely drought-tolerant and self-seeds freely. Pet-safe. A classic cottage-garden plant that naturalises with minimal care.
Growth habit: Upright biennial or short-lived perennial forming a basal rosette of silver-white, woolly, oblong leaves in the first year, then branched, silver-felted flowering stems in the second year bearing vivid magenta-pink or white flowers.
What fertiliser rose campion actually wants — and why
Rose campion is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.
A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom.
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 rose campion: 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 rose campion, 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 rose campion:
Do not feed. Fertilising produces excessively lush, floppy growth in this plant, which performs best in unfertilised, poor soil. Additional nutrients also reduce the characteristic silver intensity of the felted foliage. For a hungry bloomer that means feeding regularly — sparingly through the growing season — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
The dormant-season rule matters more than the exact interval: skip feeding entirely when rose campion 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 rose campion
Follow the flowering-feed label rate for rose campion, or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.
Feeding always goes onto already-damp soil, never dry roots — water rose campion first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the rose campion watering schedule.
Signs you are over-feeding rose campion
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for rose campion:
- Lots of lush leaves but few flowers (too much nitrogen).
- Scorched leaf edges and salt crust from too-strong or too-frequent feeds.
- Soft, sappy growth prone to aphids and mildew.
Signs you are under-feeding rose campion
- Sparse, small, short-lived flowers and pale foliage.
- A tired plant that stops blooming early in the season.
- Weak growth and poor repeat-flowering after the first flush.
If the symptoms point at watering, light or roots rather than nutrition, the full rose campion care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Container-grown rose campion accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.
Organic vs synthetic feeds for rose campion
Organic options
A liquid comfrey or seaweed feed (naturally potassium-rich) plus compost or well-rotted manure as a mulch. UK: comfrey feed, organic Tomorite, or rose feed; US: Espoma Rose-tone or Neptune's Harvest. Feeds and improves soil.
Synthetic / liquid feeds
A high-potash flowering feed on a regular cadence — UK: Tomorite (Levington), Phostrogen or a specialist rose feed; US: Miracle-Gro Bloom Booster or a rose food. Fast, reliable bloom response.
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 rose campion — frequently asked questions
What fertiliser does rose campion need?
A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom. Rose campion is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.
How often should I feed rose campion?
Do not feed. Fertilising produces excessively lush, floppy growth in this plant, which performs best in unfertilised, poor soil. Additional nutrients also reduce the characteristic silver intensity of the felted foliage. Do not feed. Fertilising produces excessively lush, floppy growth in this plant, which performs best in unfertilised, poor soil. Additional nutrients also reduce the characteristic silver intensity of the felted foliage. For a hungry bloomer that means feeding regularly — sparingly through the growing season — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
What strength of feed for rose campion?
Follow the flowering-feed label rate for rose campion, or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.
What does over-feeding rose campion look like?
Lots of lush leaves but few flowers (too much nitrogen). Scorched leaf edges and salt crust from too-strong or too-frequent feeds. Soft, sappy growth prone to aphids and mildew. Using a high-nitrogen general feed on rose campion is the headline mistake — you grow a big leafy plant with few flowers. The second is simply under-feeding a genuinely hungry bloomer and getting a sparse, short display.
Should I flush the soil of rose campion?
Container-grown rose campion accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.
Keep reading
- Rose campion care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water rose campion — 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 repandens yew
- How to fertilise fastigiata yew
- How to fertilise standishii yew
- All 6887 fertilising guides in the Growli library