Fertilising guide
How to fertilise Mouse-ear Hawkweed (Pilosella officinarum)— schedule & NPK
Also called Mouse-ear Hawkweed, Mouse-ear, Hawkweed.
More about mouse-ear hawkweed
About Mouse-ear Hawkweed
Pilosella officinarum · also called Mouse-ear Hawkweed, Mouse-ear · flowering
Pilosella officinarum (syn. Hieracium pilosella) is a low-growing, stoloniferous perennial native to grasslands and dry banks across Europe and the UK, producing solitary lemon-yellow dandelion-like flower heads on hairy scapes from May to August. It thrives in poor, well-drained soils in full sun and actually performs better with minimal fertility — rich soils encourage excessive leaf growth at the expense of flowers. The most important care point is to avoid overwatering, as it is highly susceptible to root rot in wet conditions. It is not listed by the ASPCA as toxic to cats or dogs; use with caution as data is limited.
Growth habit: Low-growing, mat-forming perennial spreading by stolons and rosettes, with erect flowering scapes to 25 cm.
What fertiliser mouse-ear hawkweed actually wants — and why
Mouse-ear Hawkweed 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 mouse-ear hawkweed: 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 mouse-ear hawkweed, 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 mouse-ear hawkweed:
Avoid feeding; excess nutrients cause lush foliage and poor flowering. No fertiliser is needed in typical garden soils. 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 mouse-ear hawkweed 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 mouse-ear hawkweed
Half strength is the safe default for mouse-ear hawkweed — 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 mouse-ear hawkweed first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the mouse-ear hawkweed watering schedule.
Signs you are over-feeding mouse-ear hawkweed
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for mouse-ear hawkweed:
- 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 mouse-ear hawkweed
- 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 mouse-ear hawkweed care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of mouse-ear hawkweed 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 mouse-ear hawkweed
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 mouse-ear hawkweed — frequently asked questions
What fertiliser does mouse-ear hawkweed 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. Mouse-ear Hawkweed 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 mouse-ear hawkweed?
Avoid feeding; excess nutrients cause lush foliage and poor flowering. No fertiliser is needed in typical garden soils. Avoid feeding; excess nutrients cause lush foliage and poor flowering. No fertiliser is needed in typical garden soils. 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 mouse-ear hawkweed?
Half strength is the safe default for mouse-ear hawkweed — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding mouse-ear hawkweed 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 mouse-ear hawkweed 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 mouse-ear hawkweed?
Flush the pot of mouse-ear hawkweed 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
- Mouse-ear Hawkweed care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water mouse-ear hawkweed — 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