Fertilising guide
How to fertilise Cut-Leaved Cranesbill (Geranium dissectum)— schedule & NPK
Also called Cut-Leaved Cranesbill, Cutleaf Geranium.
More about cut-leaved cranesbill
About Cut-Leaved Cranesbill
Geranium dissectum · also called Cut-Leaved Cranesbill, Cutleaf Geranium · flowering
Geranium dissectum is a softly hairy annual native to Europe and western Asia, widely naturalised in North America and Australasia, growing in arable fields, roadsides, disturbed ground and open grassy places. It bears small, notched, deep pink to purplish-red flowers from May to August above very finely dissected, almost feathery foliage that provides a distinctive texture. It requires full sun and a moderately fertile, moist but free-draining soil to grow well. 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: Ascending to sprawling, softly hairy annual with deeply and finely cut (dissectum) palmate leaves; branching stems reach up to 60 cm under favourable conditions.
What fertiliser cut-leaved cranesbill actually wants — and why
Cut-Leaved 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 cut-leaved 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 cut-leaved 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 cut-leaved cranesbill:
No regular feeding needed; a single light application of balanced fertiliser in spring can boost flowering on very poor soils, but avoid high-nitrogen products that produce leafy growth. 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 cut-leaved 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 cut-leaved cranesbill
Half strength is the safe default for cut-leaved 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 cut-leaved cranesbill first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the cut-leaved cranesbill watering schedule.
Signs you are over-feeding cut-leaved cranesbill
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for cut-leaved 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 cut-leaved 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 cut-leaved cranesbill care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of cut-leaved 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 cut-leaved 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 cut-leaved cranesbill — frequently asked questions
What fertiliser does cut-leaved 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. Cut-Leaved 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 cut-leaved cranesbill?
No regular feeding needed; a single light application of balanced fertiliser in spring can boost flowering on very poor soils, but avoid high-nitrogen products that produce leafy growth. No regular feeding needed; a single light application of balanced fertiliser in spring can boost flowering on very poor soils, but avoid high-nitrogen products that produce leafy growth. 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 cut-leaved cranesbill?
Half strength is the safe default for cut-leaved cranesbill — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding cut-leaved 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 cut-leaved 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 cut-leaved cranesbill?
Flush the pot of cut-leaved 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
- Cut-Leaved Cranesbill care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water cut-leaved 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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- How to fertilise idaho fescue
- How to fertilise maire's fescue
- All 10153 fertilising guides in the Growli library