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Plant care

Beach Wormwood (Dusty Miller) care

Artemisia stelleriana

Also called Beach Wormwood, Dusty Miller, Oldwoman, Hoary Mugwort.

RHS H7USDA 3–7Mildly toxic to petsIndoor 15–30 cm tall

Watering rhythm

2-3weeks

Every 2–3 weeks once established; more frequent only when newly planted

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Light

Direct sun (at least 4-6 hours)

Soil

Sandy, lean, well-draining; tolerates poor and saline soils

Humidity

Low to moderate (30–50% RH)

Temp

-35°C to 35°C

Pet safety

Mildly toxic to pets

Mature size

15–30 cm tall

Care at a glance

Light

Aim for at least 4-6 hours of direct sun on the leaves. Requires full sun for at least 6 hours daily. In shade or partial shade the silvery foliage loses density and the plant becomes leggy. Tolerates intense reflected heat from walls and paving. If your only bright window faces south, that's perfect for beach wormwood — same window any aroid would fry on.

Watering

Watering beach wormwood: every 2–3 weeks once established; more frequent only when newly planted. 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. Allow soil to dry completely between waterings. Overwatering or poor drainage causes root and crown rot. In humid climates, water even less to avoid fungal issues.

Soil and pot

Beach Wormwood grows best in sandy, lean, well-draining; tolerates poor and saline soils. Thrives in sandy loam or gravelly soil with low to moderate fertility. Avoid heavy clay or rich, moisture-retentive mixes — excess nutrients produce lush but floppy growth. Tolerates slightly alkaline to neutral pH (6.5–7.5). 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

Beach Wormwood sits happiest at around Low to moderate (30–50% RH) humidity and -35°C to 35°C (-31°F to 95°F). Adapted to coastal and dry-continental conditions. High humidity combined with poor airflow encourages botrytis and powdery mildew on the felt-covered leaves. Space plants generously. 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 beach wormwood sparingly. Minimal feeding needed. A single application of balanced slow-release fertiliser in spring is sufficient. Over-fertilising produces rank, soft growth prone to flopping and disease. 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 beach wormwood in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Root and crown rot — The most common failure. Caused by waterlogged or clay-heavy soil. Ensure sharp drainage; raise beds or add grit if needed.
  • Powdery mildew — Can develop in humid, still conditions despite the felted foliage. Improve air circulation by cutting back in late summer and not crowding plants.
  • Flopping / leggy growth — Occurs in shade or overly rich soil. Shear plants by one-third in early summer to encourage compact mounding and refresh silvery colour.

Propagation

Divide clumps in spring or early autumn. Take 8–10 cm softwood or semi-ripe cuttings in summer; root in free-draining compost. Seed is viable but highly variable — vegetative propagation preferred for named cultivars. 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

Beach Wormwood is mildly toxic to pets. ASPCA lists Artemisia dracunculus (tarragon) as toxic to cats, dogs, and horses (essential oils; clinical signs: vomiting, diarrhea). Other Artemisia species contain similar volatile oils and thujone and are regarded as mildly toxic to pets across the genus. A. stelleriana is not individually listed by ASPCA, but the genus should be treated as mildly toxic out of caution. Contact with foliage may also cause skin irritation in sensitive individuals. 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.

Beach Wormwood care — frequently asked questions

What is the common name for Artemisia stelleriana?

Artemisia stelleriana is most commonly called Beach Wormwood, but it is also known as Beach Wormwood, Dusty Miller, Oldwoman, Hoary Mugwort. The names refer to the same species, so care instructions for Beach Wormwood apply identically to anything sold as Dusty Miller.

How much light does beach wormwood need?

Beach Wormwood grows best in direct sun (at least 4-6 hours). Requires full sun for at least 6 hours daily. In shade or partial shade the silvery foliage loses density and the plant becomes leggy. Tolerates intense reflected heat from walls and paving.

How often should I water beach wormwood?

Water beach wormwood every 2–3 weeks once established; more frequent only when newly planted. Highly drought-tolerant. Allow soil to dry completely between waterings. Overwatering or poor drainage causes root and crown rot. In humid climates, water even less to avoid fungal issues. 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 beach wormwood toxic to cats and dogs?

Beach Wormwood is mildly toxic to pets. ASPCA lists Artemisia dracunculus (tarragon) as toxic to cats, dogs, and horses (essential oils; clinical signs: vomiting, diarrhea). Other Artemisia species contain similar volatile oils and thujone and are regarded as mildly toxic to pets across the genus. A. stelleriana is not individually listed by ASPCA, but the genus should be treated as mildly toxic out of caution. Contact with foliage may also cause skin irritation in sensitive individuals.

What USDA hardiness zone does beach wormwood grow in?

Beach Wormwood is rated for USDA zone 3–7 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Beach Wormwood deep-dive guides

Every aspect of beach wormwood care, each with its own calibrated guide:

Related guides

Beach Wormwood is also known as Beach Wormwood, Dusty Miller, Oldwoman, and Hoary Mugwort.