Fertilising guide
How to fertilise Trevi Fountain Pulmonaria (Pulmonaria 'Trevi Fountain')— schedule & NPK
Also called Trevi Fountain lungwort, blue lungwort.
More about trevi fountain pulmonaria
About Trevi Fountain Pulmonaria
Pulmonaria 'Trevi Fountain' · also called Trevi Fountain lungwort, blue lungwort · flowering
'Trevi Fountain' is a lungwort grown for unusually pure cobalt-blue spring flowers held above silver-spotted green leaves. It forms neat clumps for moist, shaded borders and woodland gardens and is loved by early bees. Pulmonaria isn't individually ASPCA-listed, so treat it cautiously around cats and dogs.
Growth habit: Low, clump-forming, semi-evergreen perennial spreading slowly by rhizomes into tidy ground cover. Blue flower clusters open early in spring on short stems above the bristly, silver-marked leaves.
Watch for — Wilting and scorch: Dry roots or too much sun cause flagging and burnt leaf edges. Water, mulch, and move to deeper, cooler shade if recurring.
What fertiliser trevi fountain pulmonaria actually wants — and why
Trevi Fountain Pulmonaria 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 trevi fountain pulmonaria: 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 trevi fountain pulmonaria, 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 trevi fountain pulmonaria:
Low-maintenance; an annual spring mulch of compost or leaf mould usually suffices. On poorer soils, a light balanced feed in spring supports vigour. Avoid heavy nitrogen, which produces soft, mildew-prone foliage. 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 trevi fountain pulmonaria 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 trevi fountain pulmonaria
Half strength is the safe default for trevi fountain pulmonaria — 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 trevi fountain pulmonaria first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the trevi fountain pulmonaria watering schedule.
Signs you are over-feeding trevi fountain pulmonaria
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for trevi fountain pulmonaria:
- 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 trevi fountain pulmonaria
- 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 trevi fountain pulmonaria care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of trevi fountain pulmonaria 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 trevi fountain pulmonaria
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 trevi fountain pulmonaria — frequently asked questions
What fertiliser does trevi fountain pulmonaria 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. Trevi Fountain Pulmonaria 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 trevi fountain pulmonaria?
Low-maintenance; an annual spring mulch of compost or leaf mould usually suffices. On poorer soils, a light balanced feed in spring supports vigour. Avoid heavy nitrogen, which produces soft, mildew-prone foliage. Low-maintenance; an annual spring mulch of compost or leaf mould usually suffices. On poorer soils, a light balanced feed in spring supports vigour. Avoid heavy nitrogen, which produces soft, mildew-prone foliage. 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 trevi fountain pulmonaria?
Half strength is the safe default for trevi fountain pulmonaria — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding trevi fountain pulmonaria 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 trevi fountain pulmonaria 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 trevi fountain pulmonaria?
Flush the pot of trevi fountain pulmonaria 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
- Trevi Fountain Pulmonaria care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water trevi fountain pulmonaria — 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 3899 fertilising guides in the Growli library