Fertilising guide
How to fertilise Carding Mill Rose (Rosa 'Carding Mill')— schedule & NPK
Also called Carding Mill, Ausvivid.
More about carding mill rose
About Carding Mill Rose
Rosa 'Carding Mill' · also called Carding Mill, Ausvivid · flowering
Carding Mill is a David Austin English shrub rose introduced in 2003, with large cupped rosettes that blend apricot, pink, and yellow tones over a strong myrrh fragrance. It is vigorous, healthy, and repeat-flowers reliably from summer to autumn, forming an upright bushy plant well suited to mixed borders and informal hedging.
Growth habit: Upright, vigorous, bushy deciduous shrub that branches freely and repeat-flowers across the season.
What fertiliser carding mill rose actually wants — and why
Carding Mill Rose 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 carding mill rose: 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 carding mill rose, 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 carding mill rose:
Apply a balanced, potassium-rich rose feed in early spring and again after the first flush of bloom; mulch with well-rotted manure in spring for vigour. Cease feeding in late summer so new wood ripens before frost. 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 carding mill rose 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 carding mill rose
Follow the flowering-feed label rate for carding mill rose, 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 carding mill rose first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the carding mill rose watering schedule.
Signs you are over-feeding carding mill rose
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for carding mill rose:
- 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 carding mill rose
- 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 carding mill rose care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Container-grown carding mill rose 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 carding mill rose
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 carding mill rose — frequently asked questions
What fertiliser does carding mill rose 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. Carding Mill Rose 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 carding mill rose?
Apply a balanced, potassium-rich rose feed in early spring and again after the first flush of bloom; mulch with well-rotted manure in spring for vigour. Cease feeding in late summer so new wood ripens before frost. Apply a balanced, potassium-rich rose feed in early spring and again after the first flush of bloom; mulch with well-rotted manure in spring for vigour. Cease feeding in late summer so new wood ripens before frost. 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 carding mill rose?
Follow the flowering-feed label rate for carding mill rose, 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 carding mill rose 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 carding mill rose 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 carding mill rose?
Container-grown carding mill rose 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
- Carding Mill Rose care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water carding mill rose — 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 peace lily
- How to fertilise bird of paradise
- How to fertilise hoya
- All 3899 fertilising guides in the Growli library