Fertilising guide
How to fertilise Creeping Willow (Salix repens)— schedule & NPK
Also called Creeping willow, Creeping sallow.
More about creeping willow
About Creeping Willow
Salix repens · also called Creeping willow, Creeping sallow · flowering
Salix repens is a low, spreading deciduous shrub native to damp heathlands, dune slacks, and fens across Europe including Britain and Ireland. It thrives in full sun with consistently moist soil, making it an excellent choice for bog gardens, rain gardens, or stabilising sandy coastal banks. The most critical care point is adequate moisture — even brief drought will cause leaf scorch and dieback. Salix species contain salicylates and are considered mildly toxic to cats and dogs.
Growth habit: Low, mat-forming to mound-shaped deciduous shrub with slender, spreading or ascending stems; spreads by both stems rooting where they touch the ground and by suckering.
What fertiliser creeping willow actually wants — and why
Creeping Willow 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 creeping willow: 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 creeping willow, 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 creeping willow:
Generally requires no fertiliser in garden settings; if growth is very slow, apply a balanced slow-release feed in spring, avoiding high-nitrogen products that encourage soft growth susceptible to willow aphid. 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 creeping willow 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 creeping willow
Half strength is the safe default for creeping willow — 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 creeping willow first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the creeping willow watering schedule.
Signs you are over-feeding creeping willow
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for creeping willow:
- 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 creeping willow
- 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 creeping willow care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of creeping willow 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 creeping willow
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 creeping willow — frequently asked questions
What fertiliser does creeping willow 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. Creeping Willow 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 creeping willow?
Generally requires no fertiliser in garden settings; if growth is very slow, apply a balanced slow-release feed in spring, avoiding high-nitrogen products that encourage soft growth susceptible to willow aphid. Generally requires no fertiliser in garden settings; if growth is very slow, apply a balanced slow-release feed in spring, avoiding high-nitrogen products that encourage soft growth susceptible to willow aphid. 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 creeping willow?
Half strength is the safe default for creeping willow — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding creeping willow 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 creeping willow 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 creeping willow?
Flush the pot of creeping willow 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
- Creeping Willow care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water creeping willow — 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 new zealand tree fuchsia
- How to fertilise saw-wort
- How to fertilise red campion
- All 10153 fertilising guides in the Growli library