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Plant care

Sea Purslane Sun Rose (Grey-Leaved Sun Rose) care

Halimium halimifolium

Also called Sea Purslane Sun Rose, Grey-Leaved Sun Rose, Halimium.

RHS H4USDA 8-10Mildly toxic to petsIndoor 0.9–1.5 m tall and 1–2 m wide (3–5 ft × 3–6 ft)

Watering rhythm

Direct sun (at least 4-6 hours)

Very low — drought-tolerant once established; water sparingly in the first year only

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Light

Direct sun (at least 4-6 hours)

Soil

Very well-drained, sandy, gravelly or coastal, low to moderate fertility

Humidity

Low to moderate (30–55% RH)

Temp

-8 to 40 °C

Pet safety

Mildly toxic to pets

Mature size

0.9–1.5 m tall and 1–2 m wide (3–5 ft × 3–6 ft)

Care at a glance

Light

Sea Purslane Sun Rose needs sun on the leaves, not just bright ambient room light. Full sun is non-negotiable — this coastal scrub species evolved in some of the sunniest, most exposed habitats in Europe and will not flower well or maintain a compact habit in shade. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water sea purslane sun rose very low — drought-tolerant once established; water sparingly in the first year only. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. One of the most drought-tolerant plants for a sunny border; in the UK irrigation is rarely necessary after the first growing season. Consistent overwatering, especially in winter, is the primary cause of plant loss.

Soil and pot

Sea Purslane Sun Rose grows best in very well-drained, sandy, gravelly or coastal, low to moderate fertility. Naturally at home in wind-blown coastal sands and rocky scrubland; performs well on thin, alkaline or neutral soils and tolerates mild salinity — an ideal candidate for coastal gravel or seaside gardens. 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

Sea Purslane Sun Rose sits happiest at around Low to moderate (30–55% RH) humidity and -8 to 40 °C (18 to 104 °F). Tolerates mild coastal humidity better than some Halimium species, but still requires an open, airy, sunny position; stagnant, humid air promotes fungal leaf spotting. 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 sea purslane sun rose sparingly. Fertiliser is generally not required or recommended; at most apply a very light, low-nitrogen granular feed in spring if growing in very impoverished soil that shows nutrient-deficiency symptoms. 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 sea purslane sun rose in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Waterlogging and winter wet — Even brief periods of waterlogging in winter can trigger fatal root rot. In heavier soils or high-rainfall areas, plant into raised beds or mix in up to 50% grit and plant on a slight slope so water cannot pool around the crown.
  • Vine weevil larvae damage — Vine weevil (Otiorhynchus sulcatus) larvae can attack the roots of container-grown plants, causing sudden wilting and collapse. Use nematode biological controls (Steinernema kraussei, applied late summer to early autumn when soil is above 5 °C / 41 °F) as a preventive measure.

Propagation

Root semi-ripe cuttings 6–8 cm long taken in midsummer in gritty, free-draining compost with gentle bottom heat. Seed can be sown in spring after scarification with sandpaper or brief soaking in warm water to break dormancy. 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

Sea Purslane Sun Rose is mildly toxic to pets. Halimium halimifolium is not individually assessed in the ASPCA Toxic and Non-Toxic Plant database. No specific toxic principle has been characterised, but in the absence of a confirmed non-toxic listing the species is conservatively classified as mildly-toxic for cats and dogs. Seek veterinary advice if ingestion occurs. 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.

Sea Purslane Sun Rose care — frequently asked questions

What is the common name for Halimium halimifolium?

Halimium halimifolium is most commonly called Sea Purslane Sun Rose, but it is also known as Sea Purslane Sun Rose, Grey-Leaved Sun Rose, Halimium. The names refer to the same species, so care instructions for Sea Purslane Sun Rose apply identically to anything sold as Grey-Leaved Sun Rose.

How much light does sea purslane sun rose need?

Sea Purslane Sun Rose grows best in direct sun (at least 4-6 hours). Full sun is non-negotiable — this coastal scrub species evolved in some of the sunniest, most exposed habitats in Europe and will not flower well or maintain a compact habit in shade.

How often should I water sea purslane sun rose?

Water sea purslane sun rose very low — drought-tolerant once established; water sparingly in the first year only. One of the most drought-tolerant plants for a sunny border; in the UK irrigation is rarely necessary after the first growing season. Consistent overwatering, especially in winter, is the primary cause of plant loss. 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 sea purslane sun rose toxic to cats and dogs?

Sea Purslane Sun Rose is mildly toxic to pets. Halimium halimifolium is not individually assessed in the ASPCA Toxic and Non-Toxic Plant database. No specific toxic principle has been characterised, but in the absence of a confirmed non-toxic listing the species is conservatively classified as mildly-toxic for cats and dogs. Seek veterinary advice if ingestion occurs.

What USDA hardiness zone does sea purslane sun rose grow in?

Sea Purslane Sun Rose is rated for USDA zone 8-10 and RHS hardiness H4. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Sea Purslane Sun Rose deep-dive guides

Every aspect of sea purslane sun rose care, each with its own calibrated guide:

Featured in these plant shortlists

Sea Purslane Sun Rose qualifies for 4 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Sea Purslane Sun Rose is also known as Sea Purslane Sun Rose, Grey-Leaved Sun Rose, and Halimium.