Fertilising guide
How to fertilise Long-Stalked Cranesbill (Geranium columbinum)— schedule & NPK
Also called Long-Stalked Cranesbill, Longstalk Cranesbill.
More about long-stalked cranesbill
About Long-Stalked Cranesbill
Geranium columbinum · also called Long-Stalked Cranesbill, Longstalk Cranesbill · flowering
Geranium columbinum is a slender, wiry-stemmed annual native to the UK and much of Europe, western Asia and North Africa, favouring dry calcareous grassland, hedgebanks, cliff slopes and field margins from lowland up to around 1,200 m. Its deeply cut, finely divided leaves and small pink to purple flowers appear from April to September, carried on distinctively long, slender pedicels that give the species its name. It requires well-drained, preferably calcareous soils in a warm, sunny position and dislikes wet or shaded conditions. True cranesbill Geranium species are not listed as toxic to pets by the ASPCA, and this species is considered non-toxic to cats and dogs.
Growth habit: Erect to scrambling annual with finely dissected, deeply cut leaves and distinctively long flower stalks (pedicels); branching and somewhat straggling when mature.
What fertiliser long-stalked cranesbill actually wants — and why
Long-Stalked 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 long-stalked 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 long-stalked 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 long-stalked cranesbill:
No feeding required; this species thrives on nutrient-poor ground and added fertiliser produces lush, floppy growth with reduced flowering. 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 long-stalked 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 long-stalked cranesbill
Half strength is the safe default for long-stalked 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 long-stalked cranesbill first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the long-stalked cranesbill watering schedule.
Signs you are over-feeding long-stalked cranesbill
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for long-stalked 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 long-stalked 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 long-stalked cranesbill care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of long-stalked 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 long-stalked 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 long-stalked cranesbill — frequently asked questions
What fertiliser does long-stalked 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. Long-Stalked 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 long-stalked cranesbill?
No feeding required; this species thrives on nutrient-poor ground and added fertiliser produces lush, floppy growth with reduced flowering. No feeding required; this species thrives on nutrient-poor ground and added fertiliser produces lush, floppy growth with reduced flowering. 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 long-stalked cranesbill?
Half strength is the safe default for long-stalked cranesbill — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding long-stalked 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 long-stalked 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 long-stalked cranesbill?
Flush the pot of long-stalked 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
- Long-Stalked Cranesbill care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water long-stalked cranesbill — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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- All 10153 fertilising guides in the Growli library