Fertilising guide
How to fertilise Raspberry Splash Pulmonaria (Pulmonaria 'Raspberry Splash')— schedule & NPK
Also called Raspberry Splash lungwort, pink-flowered pulmonaria.
More about raspberry splash pulmonaria
About Raspberry Splash Pulmonaria
Pulmonaria 'Raspberry Splash' · also called Raspberry Splash lungwort, pink-flowered pulmonaria · flowering
'Raspberry Splash' is an upright lungwort with narrow, silver-spotted green leaves and early spring flowers in vivid raspberry-pink to coral that contrast handsomely with the foliage. It forms tidy clumps for moist, shady borders and woodland edges. The genus isn't individually ASPCA-listed, so treat it cautiously around pets.
Growth habit: Upright, clump-forming, semi-evergreen perennial with a tidy mound of long, narrow bristly leaves. Flowers appear early in spring on short stems; spreads slowly into compact ground cover.
What fertiliser raspberry splash pulmonaria actually wants — and why
Raspberry Splash 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 raspberry splash 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 raspberry splash 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 raspberry splash pulmonaria:
Undemanding; an annual spring mulch of compost or leaf mould typically meets its needs. A light balanced feed in spring on poor soils boosts the foliage. Avoid excess nitrogen, which softens growth and encourages mildew. 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 raspberry splash 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 raspberry splash pulmonaria
Half strength is the safe default for raspberry splash 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 raspberry splash pulmonaria first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the raspberry splash pulmonaria watering schedule.
Signs you are over-feeding raspberry splash pulmonaria
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for raspberry splash 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 raspberry splash 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 raspberry splash pulmonaria care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of raspberry splash 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 raspberry splash 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 raspberry splash pulmonaria — frequently asked questions
What fertiliser does raspberry splash 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. Raspberry Splash 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 raspberry splash pulmonaria?
Undemanding; an annual spring mulch of compost or leaf mould typically meets its needs. A light balanced feed in spring on poor soils boosts the foliage. Avoid excess nitrogen, which softens growth and encourages mildew. Undemanding; an annual spring mulch of compost or leaf mould typically meets its needs. A light balanced feed in spring on poor soils boosts the foliage. Avoid excess nitrogen, which softens growth and encourages mildew. 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 raspberry splash pulmonaria?
Half strength is the safe default for raspberry splash pulmonaria — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding raspberry splash 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 raspberry splash 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 raspberry splash pulmonaria?
Flush the pot of raspberry splash 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
- Raspberry Splash Pulmonaria care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water raspberry splash 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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