Fertilising guide
How to fertilise Black Scallop Bugle (Ajuga reptans 'Black Scallop')— schedule & NPK
Also called Black Scallop Bugle, Black Scallop Bugleweed, Carpet Bugle.
More about black scallop bugle
About Black Scallop Bugle
Ajuga reptans 'Black Scallop' · also called Black Scallop Bugle, Black Scallop Bugleweed · flowering
Black Scallop is a striking groundcover valued for its exceptionally dark, near-black, scallop-edged foliage that stays attractive year-round. Short spikes of intense violet-blue flowers appear in spring. Compact and vigorous, it excels as an edging plant, in containers, or massed under trees. Tolerates shade and poor soils better than most ornamentals.
Growth habit: Low, mat-forming groundcover spreading via stolons
Watch for — Foliage greening: In deep shade or with excess nitrogen, the near-black leaves may revert toward green, reducing ornamental value. Ensure at least some indirect light reaches the planting and avoid high-nitrogen feeds.
What fertiliser black scallop bugle actually wants — and why
Black Scallop Bugle 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 black scallop bugle: 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 black scallop bugle, 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 black scallop bugle:
A single application of balanced slow-release fertiliser in early spring is sufficient. Too much nitrogen leads to green-tinted foliage, diminishing the dark coloration that makes this cultivar desirable. Do not feed in late summer or autumn. 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 black scallop bugle 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 black scallop bugle
Half strength is the safe default for black scallop bugle — 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 black scallop bugle first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the black scallop bugle watering schedule.
Signs you are over-feeding black scallop bugle
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for black scallop bugle:
- 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 black scallop bugle
- 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 black scallop bugle care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of black scallop bugle 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 black scallop bugle
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 black scallop bugle — frequently asked questions
What fertiliser does black scallop bugle 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. Black Scallop Bugle 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 black scallop bugle?
A single application of balanced slow-release fertiliser in early spring is sufficient. Too much nitrogen leads to green-tinted foliage, diminishing the dark coloration that makes this cultivar desirable. Do not feed in late summer or autumn. A single application of balanced slow-release fertiliser in early spring is sufficient. Too much nitrogen leads to green-tinted foliage, diminishing the dark coloration that makes this cultivar desirable. Do not feed in late summer or autumn. 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 black scallop bugle?
Half strength is the safe default for black scallop bugle — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding black scallop bugle 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 black scallop bugle 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 black scallop bugle?
Flush the pot of black scallop bugle 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
- Black Scallop Bugle care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water black scallop bugle — 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 geum 'prinses juliana'
- How to fertilise persicaria amplexicaulis 'alba'
- How to fertilise persicaria amplexicaulis 'blackfield'
- All 8452 fertilising guides in the Growli library