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Rock Garden Plants A to Z:
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Asperula- (Alpine Woodruff)
Asperula suberosa |
The weak stems of the Alpine Woodruffs form clumps or loose mats
and bear the tiny leaves in whorls. These leaves are of two types - there
are smooth-surfaced species which can be grown fairly easily outdoors and
the woolly ones which hate winter rain and need either protection or the
comfort of an alpine house. The flowers are borne in clusters and are distinctly
tubular. Pink is the usual color, but white and yellow Woodruffs are available.
The flowering season is early summer.
VARIETIES:
A. lilaciflora caespitosa
is
a prostate plant, forming cushions of glossy green leaves and an abundance
of 1 in., long lilac-pink flowers. Grow it in an open spot in the rock garden.
An even easier plant to grow outdoors is
A.
gussonii which produces 4 in., high woody-based tufts. The flowers are
flesh-pink. The most popular wooly-leaved species is
A. suberosa
which
produces 3 in., high cushions in the alpine house. The flowers are short
(1/3 in.) and pale pink.
SITE
& SOIL: Requires well-drained gritty soil in full sun.
PROPAGATION:
Divide clumps or take cuttings in spring.
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