Fertilising guide

How to fertilise Geranium cinereum 'Lawrence Flatman' (Geranium cinereum 'Lawrence Flatman')— schedule & NPK

Also called Lawrence Flatman cranesbill.

More about geranium cinereum 'lawrence flatman'

About Geranium cinereum 'Lawrence Flatman'

Geranium cinereum 'Lawrence Flatman' · also called Lawrence Flatman cranesbill · flowering

Geranium cinereum 'Lawrence Flatman' is a compact alpine cranesbill with low rosettes of grey-green foliage. Over a long summer season it bears cupped pink flowers heavily veined in crimson-purple with a darker eye, a touch bolder than 'Ballerina'. Sun-loving and tidy, it excels in rock gardens, troughs, gravel beds and free-draining border edges.

Growth habit: Low, mounding, clump-forming alpine perennial making a tight grey-leaved rosette that increases slowly; cushion-like rather than spreading by runners.

Watch for — Vine weevil: Larvae feed on roots of pot- and trough-grown plants, causing sudden wilting. Check rootballs at potting time and use nematode controls if grubs are present.

What fertiliser geranium cinereum 'lawrence flatman' actually wants — and why

Geranium cinereum 'Lawrence Flatman' 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 cinereum 'lawrence flatman': 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 cinereum 'lawrence flatman', 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 cinereum 'lawrence flatman':

Minimal. Rich feeding ruins the compact habit. A single weak spring feed or a thin grit-and-compost dressing keeps it in good health. 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 cinereum 'lawrence flatman' 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 cinereum 'lawrence flatman'

Follow the flowering-feed label rate for geranium cinereum 'lawrence flatman', 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 cinereum 'lawrence flatman' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the geranium cinereum 'lawrence flatman' watering schedule.

Signs you are over-feeding geranium cinereum 'lawrence flatman'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for geranium cinereum 'lawrence flatman':

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 cinereum 'lawrence flatman'

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 cinereum 'lawrence flatman' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Container-grown geranium cinereum 'lawrence flatman' 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 cinereum 'lawrence flatman'

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 cinereum 'lawrence flatman' — frequently asked questions

What fertiliser does geranium cinereum 'lawrence flatman' 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 cinereum 'Lawrence Flatman' 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 cinereum 'lawrence flatman'?

Minimal. Rich feeding ruins the compact habit. A single weak spring feed or a thin grit-and-compost dressing keeps it in good health. Minimal. Rich feeding ruins the compact habit. A single weak spring feed or a thin grit-and-compost dressing keeps it in good health. 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 cinereum 'lawrence flatman'?

What does over-feeding geranium cinereum 'lawrence flatman' 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 cinereum 'lawrence flatman' 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 cinereum 'lawrence flatman'?