Fertilising guide
How to fertilise Lungwort Pulmonaria (Pulmonaria officinalis)— schedule & NPK
Also called common lungwort, spotted lungwort, Jerusalem cowslip.
More about lungwort pulmonaria
About Lungwort Pulmonaria
Pulmonaria officinalis · also called common lungwort, spotted lungwort · flowering
Common lungwort is a low, spreading woodland perennial with silver-spotted, bristly leaves and early spring flowers that open pink and age to blue or violet on the same stem. It thrives in shade and moist, humus-rich soil, making excellent ground cover. The genus isn't individually ASPCA-listed, so treat it with caution around pets.
Growth habit: Low, clump-forming, semi-evergreen perennial that spreads steadily by short rhizomes into weed-suppressing ground cover. Flowers appear early on short stems before the main flush of bristly basal foliage.
What fertiliser lungwort pulmonaria actually wants — and why
Lungwort 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 lungwort 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 lungwort 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 lungwort pulmonaria:
Undemanding; an annual spring mulch of leaf mould or compost usually suffices. On poor soils, a light balanced feed in spring supports leaf and flower vigour. Avoid overfeeding, which produces lush, mildew-prone 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 lungwort 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 lungwort pulmonaria
Half strength is the safe default for lungwort 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 lungwort pulmonaria first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the lungwort pulmonaria watering schedule.
Signs you are over-feeding lungwort pulmonaria
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for lungwort 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 lungwort 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 lungwort pulmonaria care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of lungwort 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 lungwort 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 lungwort pulmonaria — frequently asked questions
What fertiliser does lungwort 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. Lungwort 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 lungwort pulmonaria?
Undemanding; an annual spring mulch of leaf mould or compost usually suffices. On poor soils, a light balanced feed in spring supports leaf and flower vigour. Avoid overfeeding, which produces lush, mildew-prone growth. Undemanding; an annual spring mulch of leaf mould or compost usually suffices. On poor soils, a light balanced feed in spring supports leaf and flower vigour. Avoid overfeeding, which produces lush, mildew-prone 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 lungwort pulmonaria?
Half strength is the safe default for lungwort pulmonaria — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding lungwort 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 lungwort 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 lungwort pulmonaria?
Flush the pot of lungwort 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
- Lungwort Pulmonaria care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water lungwort 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