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Rock Garden Plants A to Z:
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Achillea- (Alpine Yarrow)
Achillea kellereri |
Most Achilleas grow several feet high and are found in the herbaceous
border, but there are several dwarf species which are suitable for the rockery.
They form a mat of silvery or green finely-divided foliage and during the
summer flat heads of tiny white or yellow flowers appear. These Alpine Yarrows
are useful for covering areas of dry sandy soil or crevices between rocks
and the plants are easily propagated in the spring. Sprinkle Slug Pellets
around the plants if leaf damage is seen.
VARIETIES: The most popular species is A.
tomentosa- basic details are height 6 in. spread 1 ft. flowering period
July-September. The downey greyish leaves form a dense carpet and the yellow
flower-heads are 3 in. across. Remove dead flowers to preserve evergreen
habit. Other yellow-flowering types include
A. chrysocoma ( A.
aurea) (Foliage highly aromatic when crushed) and
A.'King
Edward' (Long flowering season). For white
flowers and silvery foliage pick A.
argentea (A. clavannae) or
A.
kellereri.
SITE
& SOIL: Requires well-drained infertile soil in full sun.
PROPAGATION:
Divide clumps or take cuttings in spring.
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