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Rock Garden Plants A to Z:
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Helianthemum- (Rock Rose)
Helianthemum 'Wisely Primrose' |
Few plants can match the ability of the lowly Rock Rose to provide
such a long-lasting sheet of orange or yellow flowers during the summer months.
Each flower lives for only a day or two, but new ones are borne in profusion
between May and July. The spreading wiry stems become straggly and invasive
if wrongly treated. Once the first flush of flowers have faded you must cut
them back hard to prolong the life of the plant and to induce another flush.
VARIETIES:
Nearly all the Helianthemums grown in the rock garden are named varieties
of
H.
nummularium. The basic details are height 6-9 in. spread 2ft., papery flowers
1 in. across. The varieties may be single or double, and the colors range
from white to deep red. Well-known ones include
'The
Bride' (white),
'Fire
Dragon' (orange) and
'Wisely
Primrose' (yellow). The 'Ben' series
('Ben
Hope',
'Ben
Ledi' etc) are reputed to be the hardiest.
H.
alpestre (height 4 in., spread 1ft., yellow flowers) is an uncommon alpine
relative.
SITE
& SOIL:
Requires free-draining gritty soil in full sun.
PROPAGATION:
Plant stem cuttings in a cold frame in late summer.
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