Fertilising guide
How to fertilise Field Mouse-ear (Cerastium arvense)— schedule & NPK
Also called Field Mouse-ear, Field Chickweed, Field Mouse-ear Chickweed.
More about field mouse-ear
About Field Mouse-ear
Cerastium arvense · also called Field Mouse-ear, Field Chickweed · flowering
Field mouse-ear is a low, mat-forming perennial native to grasslands, rocky outcrops, and dry banks across the UK, Europe, and North America, growing naturally in poor, well-drained soils in full sun. Its starry white five-petalled flowers appear prolifically from April to August, making it an attractive, drought-tolerant ground cover for sunny rock or gravel gardens. The single most important care fact is that it requires freely draining, lean soil and will rot quickly in heavy clay or moist conditions. Field mouse-ear is not listed on the ASPCA Toxic and Non-Toxic Plant database; it is classified here as mildly-toxic out of caution as no confirmed pet-safe clearance was found.
Growth habit: Low, spreading, mat-forming perennial herb with narrow, hairy grey-green leaves; spreading by both rhizomes and stems that root at nodes.
What fertiliser field mouse-ear actually wants — and why
Field Mouse-ear 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 field mouse-ear: 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 field mouse-ear, 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 field mouse-ear:
Fertilising is unnecessary and harmful — it promotes rank, floppy growth and reduces flowering; this plant thrives in lean conditions. 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 field mouse-ear 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 field mouse-ear
Half strength is the safe default for field mouse-ear — 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 field mouse-ear first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the field mouse-ear watering schedule.
Signs you are over-feeding field mouse-ear
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for field mouse-ear:
- 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 field mouse-ear
- 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 field mouse-ear care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of field mouse-ear 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 field mouse-ear
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 field mouse-ear — frequently asked questions
What fertiliser does field mouse-ear 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. Field Mouse-ear 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 field mouse-ear?
Fertilising is unnecessary and harmful — it promotes rank, floppy growth and reduces flowering; this plant thrives in lean conditions. Fertilising is unnecessary and harmful — it promotes rank, floppy growth and reduces flowering; this plant thrives in lean conditions. 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 field mouse-ear?
Half strength is the safe default for field mouse-ear — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding field mouse-ear 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 field mouse-ear 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 field mouse-ear?
Flush the pot of field mouse-ear 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
- Field Mouse-ear care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water field mouse-ear — 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 nikko fir
- How to fertilise red fir
- How to fertilise common milkweed
- All 10153 fertilising guides in the Growli library