Artemisia vallesiaca

RHS Plant Profile

Swiss wormwood

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Synonyms

Seriphidium vallesiacum

Herbaceous Perennial

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A woody-based herbaceous perennial to 45cm in height, with silvery-white leaves 2-4cm in length, finely divided into linear segments. Flowerheads small, yellowish, in arching spikes

Position

Full sun

Soil Types

Chalk, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Chalk Sand

Moisture: Well–drained
pH: Alkaline or Neutral

Position

Full sun

Aspect: South–facing or East–facing
Exposure: Exposed
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H4
Drought Resistance: Yes

Colour & Scent

Fragrance Foliage

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Asteraceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy
Genus: Artemisia can be shrubs, perennials or annuals, evergreen or deciduous, with usually grey, aromatic, often divided foliage and rather insignificant flower-heads
Name Status: Correct

How to Grow

Cultivation

Grow in fertile well-drained soil in sun. Can die back in heavy, poorly-drained soil

Propagation

Propagate by seed sown in containers in a cold frame in spring or propagate by rooting semi-hardwood cuttings in late summer, with bottom heat

Suggested planting locations and garden types

Coastal
Cottage and informal garden
City and courtyard gardens
Gravel garden
Patio and container plants
Flower borders and beds

Pruning

Pruning group 9

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus