Artemisia laxa, a horticultural synonym of Artemisia umbelliformis, is a perennial wormwood native to the mountains of south-western and central Europe. It differs from large shrubby artemisias through its finely divided, aromatic, silvery-grey foliage and compact habit. Its small yellow flower heads appear in summer. Once established in well-drained soil, it can tolerate periods of dry weather.
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The stated dimensions represent the average horticultural size reported for plant material marketed under the name Artemisia laxa. Botanical descriptions of the wild species generally indicate a smaller growth habit.
Characteristics of Artemisia laxa
This artemisia develops a branched clump of slender stems that become slightly woody at the base. Its deciduous leaves are deeply divided, covered with fine hairs and characterised by their silvery-grey colour. They release an aromatic scent when crushed. From July to August, small yellow flower heads are grouped on upright stems above the foliage. Their ornamental value remains secondary to the texture and colour of the leaves. The plant’s more compact habit and lighter silhouette distinguish it from larger shrubby artemisias.
How to use Artemisia laxa?
Artemisia laxa is suitable for rock gardens, sunny borders, well-drained banks and the front of planting beds. Its silvery foliage provides a clear contrast with lavenders, santolinas, sages, rock roses and compact ornamental grasses. It can also be planted in gravel gardens or on walls, provided that excess water drains away rapidly. For container cultivation, use a pot of at least 10 litres with drainage holes and a growing medium containing a high proportion of free-draining mineral material. Its limited size is not suitable for hedging or screening, but it can be used to form low borders.
What are the recommended cultivation practices for Artemisia laxa?
Plant this artemisia in full sun, in light, poor to moderately fertile and thoroughly drained soil. It tolerates neutral to slightly alkaline substrates. Allow 50–60 cm between plants. In heavy soil, incorporate gravel or pumice and position the root ball slightly above ground level to reduce winter moisture around the crown. Water regularly after planting until the root system is established, then irrigate only during extended dry periods. Container-grown plants require more frequent monitoring. Avoid fertilisers high in nitrogen. Prune lightly in spring to maintain a compact, branched clump, without cutting deeply into old woody growth.
