Fertilising guide
How to fertilise Physocarpus opulifolius 'Little Devil' (Physocarpus opulifolius 'Donna May' (Little Devil))— schedule & NPK
Also called Little Devil ninebark, dwarf purple ninebark.
More about physocarpus opulifolius 'little devil'
About Physocarpus opulifolius 'Little Devil'
Physocarpus opulifolius 'Donna May' (Little Devil) · also called Little Devil ninebark, dwarf purple ninebark · flowering
'Little Devil' is a true dwarf ninebark, a neat mound of small, deep burgundy leaves topped with pinkish-white flower clusters in early summer. Its compact size and fine texture suit small gardens, borders and containers, and it shows good mildew resistance. Extremely hardy and adaptable, it holds the richest colour in full sun on most well-worked soils.
Growth habit: Dwarf, dense, rounded deciduous shrub with small fine-textured leaves and the characteristic peeling ninebark stems; rarely needs hard pruning to stay tidy.
What fertiliser physocarpus opulifolius 'little devil' actually wants — and why
Physocarpus opulifolius 'Little Devil' 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 physocarpus opulifolius 'little devil': 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 physocarpus opulifolius 'little devil', 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 physocarpus opulifolius 'little devil':
Low feeder. A spring compost mulch or one balanced slow-release feed suffices; container specimens benefit from a light feed in spring. Avoid heavy nitrogen. 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 physocarpus opulifolius 'little devil' 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 physocarpus opulifolius 'little devil'
Half strength is the safe default for physocarpus opulifolius 'little devil' — 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 physocarpus opulifolius 'little devil' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the physocarpus opulifolius 'little devil' watering schedule.
Signs you are over-feeding physocarpus opulifolius 'little devil'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for physocarpus opulifolius 'little devil':
- 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 physocarpus opulifolius 'little devil'
- 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 physocarpus opulifolius 'little devil' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of physocarpus opulifolius 'little devil' 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 physocarpus opulifolius 'little devil'
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 physocarpus opulifolius 'little devil' — frequently asked questions
What fertiliser does physocarpus opulifolius 'little devil' 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. Physocarpus opulifolius 'Little Devil' 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 physocarpus opulifolius 'little devil'?
Low feeder. A spring compost mulch or one balanced slow-release feed suffices; container specimens benefit from a light feed in spring. Avoid heavy nitrogen. Low feeder. A spring compost mulch or one balanced slow-release feed suffices; container specimens benefit from a light feed in spring. Avoid heavy nitrogen. 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 physocarpus opulifolius 'little devil'?
Half strength is the safe default for physocarpus opulifolius 'little devil' — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding physocarpus opulifolius 'little devil' 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 physocarpus opulifolius 'little devil' 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 physocarpus opulifolius 'little devil'?
Flush the pot of physocarpus opulifolius 'little devil' 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
- Physocarpus opulifolius 'Little Devil' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water physocarpus opulifolius 'little devil' — 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 peace lily
- How to fertilise bird of paradise
- How to fertilise hoya
- All 3899 fertilising guides in the Growli library