Fertilising guide
How to fertilise Canary Island Lavender (Lavandula canariensis)— schedule & NPK
Also called Canary Island lavender, Canarian lavender.
More about canary island lavender
About Canary Island Lavender
Lavandula canariensis · also called Canary Island lavender, Canarian lavender · tropical
A vigorous, fast-growing lavender native to the Canary Islands, bearing finely dissected, bright emerald-green ferny foliage very different from the grey leaves of English lavender. It produces slender spikes of pale violet-purple flowers over a long season and thrives in full sun with excellent drainage. Being frost-tender, it should be overwintered under glass in all but the mildest UK or US coastal climates. Lavender is toxic to cats, dogs, and horses according to the ASPCA.
Growth habit: Upright, bushy, fast-growing evergreen subshrub with deeply divided, lacy, bright-green leaves.
What fertiliser canary island lavender actually wants — and why
Canary Island Lavender 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 canary island lavender: 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 canary island lavender, 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 canary island lavender:
Feed monthly with a balanced liquid fertiliser at half strength from spring through late summer; stop feeding in autumn and winter. Treat that as monthly 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 canary island lavender 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 canary island lavender
Half strength is the safe default for canary island lavender — 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 canary island lavender first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the canary island lavender watering schedule.
Signs you are over-feeding canary island lavender
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for canary island lavender:
- 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 canary island lavender
- 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 canary island lavender care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of canary island lavender 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 canary island lavender
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 canary island lavender — frequently asked questions
What fertiliser does canary island lavender 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. Canary Island Lavender 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 canary island lavender?
Feed monthly with a balanced liquid fertiliser at half strength from spring through late summer; stop feeding in autumn and winter. Feed monthly with a balanced liquid fertiliser at half strength from spring through late summer; stop feeding in autumn and winter. Treat that as monthly 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 canary island lavender?
Half strength is the safe default for canary island lavender — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding canary island lavender 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 canary island lavender 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 canary island lavender?
Flush the pot of canary island lavender 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
- Canary Island Lavender care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water canary island lavender — 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 flandria blushing bromeliad
- How to fertilise marble bromeliad
- How to fertilise johann's neoregelia
- All 10153 fertilising guides in the Growli library