Fertilising guide
How to fertilise Alan Fradd Rock Rose (Cistus × purpureus 'Alan Fradd')— schedule & NPK
Also called Alan Fradd rock rose, Purple-flowered rock rose 'Alan Fradd'.
More about alan fradd rock rose
About Alan Fradd Rock Rose
Cistus × purpureus 'Alan Fradd' · also called Alan Fradd rock rose, Purple-flowered rock rose 'Alan Fradd' · flowering
Cistus × purpureus 'Alan Fradd' is a distinctive hardy cultivar of the purple rock rose hybrid, bearing unusually large, tissue-thin white flowers with a bold crimson-maroon blotch at the base of each petal and a central boss of golden anthers, creating a dramatic bicolour effect from summer into early autumn. Despite the species epithet purpureus, 'Alan Fradd' is effectively a white-flowered form of this hybrid, which is itself a cross between Cistus creticus and Cistus ladanifer. Like all rock roses, the golden rule is full sun combined with sharply drained, lean soil — wet winters are far more lethal than frost. It tolerates coastal exposure and poor, stony soils with ease. Cistus is not listed on the ASPCA toxic plant database; classified mildly-toxic as a precaution.
Growth habit: Upright-to-rounded, compact evergreen shrub with dark green, slightly sticky, lance-shaped leaves; fast-growing in the first few years, settling to a tidy mound; individual flowers last only one day but new blooms open each morning over a long season.
What fertiliser alan fradd rock rose actually wants — and why
Alan Fradd Rock 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 alan fradd rock 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 alan fradd rock 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 alan fradd rock rose:
No fertiliser required or beneficial. Growing in lean soil replicates the Mediterranean garrigue where Cistus × purpureus thrives and produces the best-quality, disease-resistant growth. Feeding encourages rank, short-lived stems. 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 alan fradd rock 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 alan fradd rock rose
Follow the flowering-feed label rate for alan fradd rock 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 alan fradd rock rose first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the alan fradd rock rose watering schedule.
Signs you are over-feeding alan fradd rock rose
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for alan fradd rock 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 alan fradd rock 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 alan fradd rock rose care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Container-grown alan fradd rock 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 alan fradd rock 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 alan fradd rock rose — frequently asked questions
What fertiliser does alan fradd rock 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. Alan Fradd Rock 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 alan fradd rock rose?
No fertiliser required or beneficial. Growing in lean soil replicates the Mediterranean garrigue where Cistus × purpureus thrives and produces the best-quality, disease-resistant growth. Feeding encourages rank, short-lived stems. No fertiliser required or beneficial. Growing in lean soil replicates the Mediterranean garrigue where Cistus × purpureus thrives and produces the best-quality, disease-resistant growth. Feeding encourages rank, short-lived stems. 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 alan fradd rock rose?
Follow the flowering-feed label rate for alan fradd rock 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 alan fradd rock 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 alan fradd rock 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 alan fradd rock rose?
Container-grown alan fradd rock 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
- Alan Fradd Rock Rose care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water alan fradd rock 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 many-flowered ruschia
- How to fertilise peregrina
- How to fertilise sheerwater seedling rowan
- All 10153 fertilising guides in the Growli library