Fertilising guide
How to fertilise Geranium endressii (Geranium endressii)— schedule & NPK
Also called Endres cranesbill, French cranesbill.
More about geranium endressii
About Geranium endressii
Geranium endressii · also called Endres cranesbill, French cranesbill · flowering
A reliable, long-flowering cranesbill from the Pyrenees bearing bright rose-pink, trumpet-shaped flowers from early summer well into autumn above fresh green, semi-evergreen foliage. One parent of the popular x oxonianum hybrids, G. endressii is vigorous, shade-tolerant, and easy, spreading by rhizomes to make excellent weed-suppressing groundcover for borders and rough ground.
Growth habit: Vigorous, rhizomatous mound spreading steadily outward into groundcover; semi-evergreen fresh-green foliage gives good weed suppression through much of the year.
What fertiliser geranium endressii actually wants — and why
Geranium endressii 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 geranium endressii: 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 geranium endressii, 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 geranium endressii:
Light feeder. An annual spring compost mulch or single balanced slow-release feed is enough. Over-feeding promotes leafy, floppy growth at the expense of flowering, so keep fertiliser minimal on average soil. 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 geranium endressii 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 geranium endressii
Follow the flowering-feed label rate for geranium endressii, 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 geranium endressii first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the geranium endressii watering schedule.
Signs you are over-feeding geranium endressii
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for geranium endressii:
- 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 geranium endressii
- 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 geranium endressii care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Container-grown geranium endressii 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 geranium endressii
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 geranium endressii — frequently asked questions
What fertiliser does geranium endressii 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. Geranium endressii 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 geranium endressii?
Light feeder. An annual spring compost mulch or single balanced slow-release feed is enough. Over-feeding promotes leafy, floppy growth at the expense of flowering, so keep fertiliser minimal on average soil. Light feeder. An annual spring compost mulch or single balanced slow-release feed is enough. Over-feeding promotes leafy, floppy growth at the expense of flowering, so keep fertiliser minimal on average soil. 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 geranium endressii?
Follow the flowering-feed label rate for geranium endressii, 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 geranium endressii 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 geranium endressii 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 geranium endressii?
Container-grown geranium endressii 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
- Geranium endressii care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water geranium endressii — 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 5561 fertilising guides in the Growli library