Achillea umbellata, a perennial species native to the rocky mountain regions of Greece, is commonly known as umbellate yarrow. It differs from taller border yarrows through its very low habit, finely divided silver-grey foliage and compact, non-invasive growth. Its small pure white flower heads with cream centres brighten rock gardens while offering excellent resistance to cold and drought.
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Characteristics of Achillea umbellata
Achillea umbellata belongs to the Asteraceae family. This perennial forms a compact clump approximately 15 to 20 cm high and 25 cm wide. Its grey-green to silver foliage is finely divided, slightly downy and retains good winter presence in well-drained soil. From June to August, short upright stems carry flattened clusters of small white flowers with cream centres. Its growth remains significantly lower and more regular than that of conventional yarrows. Very hardy, it tolerates exposed positions and poor soils but does not thrive in heavy ground or soils that remain waterlogged during winter.
How to use Achillea umbellata?
Achillea umbellata is particularly suitable for rock gardens, gravel gardens, retaining walls, dry slopes and sunny borders. Its spreading growth allows it to be used as a low ground cover between stones or at the front of a planting scheme. It is also suitable for troughs, alpine containers and green roofs with a sufficiently deep mineral substrate. Its silver foliage complements thymes, sedums, dwarf lavenders, artemisias and ornamental grasses adapted to dry conditions. With its moderate growth and low competitive habit, it integrates easily into Mediterranean-style, naturalistic and low-maintenance landscapes. Its flowers also provide a useful food source for pollinating insects.
What advice ensures successful cultivation of Achillea umbellata?
Plant Achillea umbellata in spring or early autumn, in full sun and in light, stony, sandy or calcareous soil. Excellent drainage is essential, especially during winter. Allow approximately 25 to 30 cm between plants, corresponding to nine to twelve plants per square metre. Water regularly during establishment, then reduce irrigation once the plant is well rooted. Avoid nitrogen-rich fertilisers, which reduce the compact habit and silver colouring of the foliage. Remove faded flowers to extend the ornamental effect and clear away damaged leaves at the end of winter. Divide mature clumps in spring when the centre begins to thin out.
