Fertilising guide
How to fertilise Canary Island Sea Lavender (Limonium pectinatum)— schedule & NPK
Also called Canary Island sea lavender.
More about canary island sea lavender
About Canary Island Sea Lavender
Limonium pectinatum · also called Canary Island sea lavender · flowering
Limonium pectinatum is a tender, shrubby perennial endemic to the coastal cliffs and rocky shores of the Canary Islands, where it is adapted to near-year-round warmth, salt winds, and fast-draining volcanic soils. It forms a spreading, low woody mound with stiff, comb-like leaves (the species name refers to the pectinate, comb-toothed leaf margins) and bears clusters of small flowers in summer. In the UK and most of the US it must be grown in a frost-free greenhouse or conservatory and treated as a tender perennial or container specimen. Limonium is non-toxic to cats and dogs according to the ASPCA.
Growth habit: Low, spreading, woody-based sub-shrub with stiff, pectinate leaves and branching, wispy flowering stems.
Watch for — Red spider mite: Thrives in warm, dry greenhouse conditions; look for fine webbing and pale stippling on the stiff leaves. Raise humidity locally or use a predatory mite (Phytoseiulus persimilis) as a biological control.
What fertiliser canary island sea lavender actually wants — and why
Canary Island Sea Lavender flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.
Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency.
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 sea 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 sea 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 sea lavender:
Feed once a month with a balanced liquid fertiliser at half strength during active growth (spring–summer); do not feed in winter. In practice: no routine feeding at all for canary island sea lavender — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.
The dormant-season rule matters more than the exact interval: skip feeding entirely when canary island sea 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 sea lavender
None is the correct answer for canary island sea lavender. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.
Feeding always goes onto already-damp soil, never dry roots — water canary island sea 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 sea lavender watering schedule.
Signs you are over-feeding canary island sea lavender
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for canary island sea lavender:
- Abundant leafy growth and very few flowers (the classic over-rich symptom).
- Soft, floppy stems and a sprawling, leafy habit.
- Scorched edges and salt crust if it has been fed in a container.
Signs you are under-feeding canary island sea lavender
- Effectively never an issue — these plants flower on poverty.
- Only on genuinely dead soil: weak, thin growth and few blooms.
- A short-lived plant in completely spent container compost.
If the symptoms point at watering, light or roots rather than nutrition, the full canary island sea lavender care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
If canary island sea lavender has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.
Organic vs synthetic feeds for canary island sea lavender
Organic options
A thin compost mulch for soil structure is the absolute most; mostly, give it nothing. UK/US: leave it lean — no manure, no liquid feed. Poor soil is the active ingredient here.
Synthetic / liquid feeds
None. Synthetic feeds, particularly anything with appreciable nitrogen, directly suppress flowering in canary island sea lavender.
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 sea lavender — frequently asked questions
What fertiliser does canary island sea lavender need?
Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency. Canary Island Sea Lavender flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.
How often should I feed canary island sea lavender?
Feed once a month with a balanced liquid fertiliser at half strength during active growth (spring–summer); do not feed in winter. Feed once a month with a balanced liquid fertiliser at half strength during active growth (spring–summer); do not feed in winter. In practice: no routine feeding at all for canary island sea lavender — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.
What strength of feed for canary island sea lavender?
None is the correct answer for canary island sea lavender. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.
What does over-feeding canary island sea lavender look like?
Abundant leafy growth and very few flowers (the classic over-rich symptom). Soft, floppy stems and a sprawling, leafy habit. Scorched edges and salt crust if it has been fed in a container. Feeding canary island sea lavender at all — especially "to help it flower" — is the defining mistake. Rich soil gives you a big green plant and almost no blooms; restraint is what produces the flowers.
Should I flush the soil of canary island sea lavender?
If canary island sea lavender has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.
Keep reading
- Canary Island Sea Lavender care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water canary island sea 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 callicarpa japonica
- How to fertilise callicarpa dichotoma
- How to fertilise hibiscus syriacus 'blue bird'
- All 10153 fertilising guides in the Growli library