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Plant care

Broad-Leaved Sea Lavender (Broad-leaved statice) care

Limonium platyphyllum

Also called Broad-leaved sea lavender, Broad-leaved statice, Sea lavender.

RHS H7USDA 3-9Pet-safeIndoor 45–75 cm tall and 45–60 cm wide in flower.

Watering rhythm

2-3weeks

Every 2–3 weeks when established

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Light

Direct sun (at least 4-6 hours)

Soil

Sandy, sharply drained

Humidity

Low to moderate (30–60%)

Temp

-28°C to 35°C

Pet safety

Pet-safe

Mature size

45–75 cm tall and 45–60 cm wide in flower.

Care at a glance

Light

Aim for at least 4-6 hours of direct sun on the leaves. Requires at least 6 hours of direct sun daily; insufficient light leads to weak, floppy stems and sparse flowering. If your only bright window faces south, that's perfect for broad-leaved sea lavender — same window any aroid would fry on.

Watering

Watering broad-leaved sea lavender: every 2–3 weeks when established. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Highly drought-tolerant once established; water thoroughly then allow the soil to dry out almost completely before watering again. Avoid wetting the crown.

Soil and pot

Broad-Leaved Sea Lavender grows best in sandy, sharply drained. Thrives in poor, sandy or gritty soil with excellent drainage; heavy clay or moisture-retentive compost causes crown rot. Tolerates alkaline and slightly saline conditions. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Broad-Leaved Sea Lavender sits happiest at around Low to moderate (30–60%) humidity and -28°C to 35°C (-18°F to 95°F). Naturally adapted to open, breezy steppe and coastal environments; it tolerates wind and salt-laden air well and does not need elevated humidity. If you keep the room above year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed broad-leaved sea lavender sparingly. Apply a balanced, low-nitrogen fertiliser once in spring at half the recommended rate; over-feeding promotes lush foliage at the expense of flowers. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on broad-leaved sea lavender in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Crown rot — The most common cause of death in heavy or poorly drained soils; roots decay rapidly in wet conditions, especially over winter. Always plant on a slope or raised bed and improve drainage with grit.
  • Powdery mildew — Can develop on foliage in humid, still conditions with low air movement; improve spacing and siting in open, breezy positions rather than relying on fungicide sprays.

Propagation

Sow seed in pots in early spring, barely covering with grit, and germinate at 15–18°C. Root cuttings taken in late winter are also effective. Division is possible but difficult due to the deep taproot; disturb as little as possible. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Broad-Leaved Sea Lavender is pet-safe. Limonium (Limonium sp.) is listed as non-toxic to cats and dogs by the ASPCA. Ingestion of large quantities may cause mild, transient gastrointestinal upset. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Broad-Leaved Sea Lavender care — frequently asked questions

What is the common name for Limonium platyphyllum?

Limonium platyphyllum is most commonly called Broad-Leaved Sea Lavender, but it is also known as Broad-leaved sea lavender, Broad-leaved statice, Sea lavender. The names refer to the same species, so care instructions for Broad-Leaved Sea Lavender apply identically to anything sold as Broad-leaved statice.

How much light does broad-leaved sea lavender need?

Broad-Leaved Sea Lavender grows best in direct sun (at least 4-6 hours). Requires at least 6 hours of direct sun daily; insufficient light leads to weak, floppy stems and sparse flowering.

How often should I water broad-leaved sea lavender?

Water broad-leaved sea lavender every 2–3 weeks when established. Highly drought-tolerant once established; water thoroughly then allow the soil to dry out almost completely before watering again. Avoid wetting the crown. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is broad-leaved sea lavender toxic to cats and dogs?

Broad-Leaved Sea Lavender is pet-safe. Limonium (Limonium sp.) is listed as non-toxic to cats and dogs by the ASPCA. Ingestion of large quantities may cause mild, transient gastrointestinal upset.

What USDA hardiness zone does broad-leaved sea lavender grow in?

Broad-Leaved Sea Lavender is rated for USDA zone 3-9 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Broad-Leaved Sea Lavender deep-dive guides

Every aspect of broad-leaved sea lavender care, each with its own calibrated guide:

Featured in these plant shortlists

Broad-Leaved Sea Lavender qualifies for 9 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Broad-Leaved Sea Lavender is also known as Broad-leaved sea lavender, Broad-leaved statice, and Sea lavender.