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Plant care

Basil-Leaved Sun Rose (Portugese Sun Rose) care

Halimium ocymoides

Also called Basil-Leaved Sun Rose, Portugese Sun Rose.

RHS H4USDA 8-10Mildly toxic to petsIndoor 0.6–0.9 m tall and 0.9–1.2 m wide (2–3 ft × 3–4 ft)

Watering rhythm

Direct sun (at least 4-6 hours)

Very low — minimal supplemental irrigation needed once established

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Light

Direct sun (at least 4-6 hours)

Soil

Very well-drained, sandy or gravelly, poor and low in fertility

Humidity

Low (25–50% RH)

Temp

-8 to 38 °C

Pet safety

Mildly toxic to pets

Mature size

0.6–0.9 m tall and 0.9–1.2 m wide (2–3 ft × 3–4 ft)

Care at a glance

Light

Most houseplants will scorch where basil-leaved sun rose thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Requires full sun all day without exception — even light dappled shade significantly reduces flowering and causes the compact habit to break down into open, weak growth. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for very low — minimal supplemental irrigation needed once established for basil-leaved sun rose, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Established plants are highly drought-tolerant and should not be watered routinely; water only during very prolonged summer dry spells, and always allow the soil to dry completely between waterings.

Soil and pot

Basil-Leaved Sun Rose grows best in very well-drained, sandy or gravelly, poor and low in fertility. Thrives in the impoverished, acidic to neutral sandy soils of its native Iberian habitat; incorporating horticultural grit (up to 50% by volume) into heavier garden soils is essential before planting. 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

Basil-Leaved Sun Rose sits happiest at around Low (25–50% RH) humidity and -8 to 38 °C (18 to 100 °F). Best suited to dry, low-humidity conditions; in wetter UK climates choose the most exposed, sunny, and freely draining site possible and avoid overhead watering. 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 basil-leaved sun rose sparingly. Avoid fertilising; in exceptionally poor soils apply a very dilute, low-nitrogen feed once in spring to avoid stressing the plant further, but rich feeding reduces hardiness and flowering quality. 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 basil-leaved sun rose in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Crown rot in wet winters — This is the primary cause of plant loss in UK gardens. Sitting in cold, wet soil over winter causes rapid crown and root rot. Ensure impeccable drainage and consider planting on a slight mound or raised bed in rainfall-heavy areas.
  • Short lifespan if not lightly pruned annually — Without regular light trimming after flowering, the plant becomes woody and increasingly sparse. Remove the flowered tips each year — never cut into old bare wood — to maintain a dense, free-flowering mound.

Propagation

Root 5–8 cm semi-ripe cuttings in midsummer in a gritty, free-draining compost mix under gentle bottom heat (18–20 °C / 64–68 °F). Seeds can also be sown fresh in autumn or scarified and sown in spring. 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

Basil-Leaved Sun Rose is mildly toxic to pets. Halimium ocymoides is not individually listed in the ASPCA Toxic and Non-Toxic Plant database and no confirmed safety assessment exists for cats or dogs. It is conservatively classified as mildly-toxic; do not allow pets to chew or ingest plant material, and consult a vet 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.

Basil-Leaved Sun Rose care — frequently asked questions

What is the common name for Halimium ocymoides?

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

How much light does basil-leaved sun rose need?

Basil-Leaved Sun Rose grows best in direct sun (at least 4-6 hours). Requires full sun all day without exception — even light dappled shade significantly reduces flowering and causes the compact habit to break down into open, weak growth.

How often should I water basil-leaved sun rose?

Water basil-leaved sun rose very low — minimal supplemental irrigation needed once established. Established plants are highly drought-tolerant and should not be watered routinely; water only during very prolonged summer dry spells, and always allow the soil to dry completely between waterings. 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 basil-leaved sun rose toxic to cats and dogs?

Basil-Leaved Sun Rose is mildly toxic to pets. Halimium ocymoides is not individually listed in the ASPCA Toxic and Non-Toxic Plant database and no confirmed safety assessment exists for cats or dogs. It is conservatively classified as mildly-toxic; do not allow pets to chew or ingest plant material, and consult a vet if ingestion occurs.

What USDA hardiness zone does basil-leaved sun rose grow in?

Basil-Leaved 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.

Basil-Leaved Sun Rose deep-dive guides

Every aspect of basil-leaved sun rose care, each with its own calibrated guide:

Featured in these plant shortlists

Basil-Leaved 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

Basil-Leaved Sun Rose is also commonly called Basil-Leaved Sun Rose or Portugese Sun Rose.