Dusty miller
Also known as
Silver ragwort, Silverdust, Cineraria maritima, Silver dust
Keep this plant’s care guide close at hand.
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Jacobaea maritima, widely known as dusty miller, is a short-lived, evergreen subshrub prized for its striking, felted silver foliage. Native to the Mediterranean coastline, it forms a compact mound 30–60 cm tall, with deeply lobed, tomentose leaves that reflect intense sun and salt spray. Small, yellow, daisy-like flowers appear in late spring to summer, but many gardeners shear them off to keep the plant dense and conserve the silvery look. Exceptionally tolerant of drought, wind, and poor, alkaline, sharply drained soils, it excels in seaside gardens, rockeries, edging, and containers where contrast and texture are needed. In colder regions it is often grown as an annual; in mild climates it behaves as a perennial or short-lived subshrub. Good drainage is essential to prevent root rot in wet winters or poorly aerated pots. Deer and rabbits typically avoid it. Formerly known in horticulture as Senecio cineraria, this species remains a dependable, low-maintenance foliage plant for sunny exposures and heat, provided watering is infrequent and soils are not overly rich.
Taxonomy
Properties & Requirements
How to care for Dusty miller
Water
Water deeply but infrequently, allowing the top 1–2 inches (2.5–5 cm) of soil to dry between waterings. Once established in the ground, irrigate roughly weekly in hot, dry weather; reduce to every 2–3 weeks with rainfall or cooler temperatures. In containers, water when the mix is 50–75% dry and always drain excess from saucers. Avoid chronically wet soil or frequent light sips, which promote shallow roots and root rot, especially in cool weather.
Light
Provide full sun for best color and compact habit—at least 6 hours of direct light daily. In very hot inland regions, light afternoon shade can reduce stress, especially in containers. Indoors, place by a bright south or west window, or supplement with grow lights to reach 10,000–20,000 lux. Insufficient light leads to legginess and greener leaves; moving to brighter conditions and periodic shearing will restore density and silvery tone.
Nutrients
Dusty miller thrives in lean soils and needs only light feeding. Mix a small amount of slow-release, balanced fertilizer (e.g., 8-8-8 to 12-12-12) into the planting hole or topdress once in spring. For containers, feed at half strength every 4–6 weeks during active growth. Avoid high nitrogen, which spurs soft, green growth and reduces the silvery color. Incorporate compost sparingly; excess fertility and moisture increase the risk of lanky growth and rot.
Temperature
Best growth occurs between 60–75°F (15–24°C). Plants tolerate heat to the mid-90s°F (35°C) with good airflow and soil drainage. Light frosts are usually tolerated; foliage may burn below about 25°F (−4°C), with whole-plant kill likely near 20°F (−6°C) unless mulched and sheltered. In climates colder than USDA Zone 7–8, treat as an annual or overwinter cuttings indoors above 45°F (7°C) in bright light. Avoid prolonged cold, wet soils.
