Fertilising guide
How to fertilise Clarke's Cranesbill (Geranium clarkei)— schedule & NPK
Also called Clarke's cranesbill, Kashmir cranesbill.
More about clarke's cranesbill
About Clarke's Cranesbill
Geranium clarkei · also called Clarke's cranesbill, Kashmir cranesbill · flowering
Geranium clarkei is a rhizomatous hardy perennial native to the alpine meadows of Kashmir and the western Himalayas, where it grows in moist, grassy habitats. It forms spreading clumps of finely divided, deeply cut foliage and bears large, upward-facing flowers in white or soft lilac with pale purple veining from early to midsummer. The most important care tip is to divide clumps every 3-4 years in spring to maintain vigour, as established mats can become congested. Considered non-toxic to cats and dogs.
Growth habit: Rhizomatous, clump-forming herbaceous perennial
What fertiliser clarke's cranesbill actually wants — and why
Clarke's Cranesbill is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
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 clarke's cranesbill: 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 clarke's cranesbill, 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 clarke's cranesbill:
Apply a balanced slow-release granular fertiliser around the crown in spring; established plants in reasonable soil need little additional feeding. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when clarke's cranesbill 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 clarke's cranesbill
Half strength is the safe default for clarke's cranesbill — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water clarke's cranesbill first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the clarke's cranesbill watering schedule.
Signs you are over-feeding clarke's cranesbill
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for clarke's cranesbill:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding clarke's cranesbill
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full clarke's cranesbill care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of clarke's cranesbill with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for clarke's cranesbill
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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 clarke's cranesbill — frequently asked questions
What fertiliser does clarke's cranesbill need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Clarke's Cranesbill is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed clarke's cranesbill?
Apply a balanced slow-release granular fertiliser around the crown in spring; established plants in reasonable soil need little additional feeding. Apply a balanced slow-release granular fertiliser around the crown in spring; established plants in reasonable soil need little additional feeding. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for clarke's cranesbill?
Half strength is the safe default for clarke's cranesbill — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding clarke's cranesbill look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding clarke's cranesbill year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of clarke's cranesbill?
Flush the pot of clarke's cranesbill with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Clarke's Cranesbill care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water clarke's cranesbill — 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 wallich's cranesbill
- How to fertilise pencilled cranesbill
- How to fertilise druce's cranesbill
- All 10153 fertilising guides in the Growli library