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Rock Garden Plants A to Z:
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Cerastium- (Snow-In-Summer)
Cerastium tomentosum |
This popular rock garden plant has a few friends amongst the experts.
Only a small minority of alpine nursery catalogues list it and the books
which mention it issue a stern warning. The silvery-leaved sheets which bear
white flowers in early summer will soon spread like a weed and choke other
plants. This is true and Cerastium has no place in an average-sized rockery,
but there is little to beat it for quickly covering a large dry bank.
VARIETIES:
The
ordinary Cerastium is
C.
tomentosum - height 4 in., spread 2 ft. or more, flowering period May-July.
The white flowers (1/2 - 1 in. across) have notched petals and are borne
in loose clusters above wooly oblong leaves. The dwarf variety
C. tomentosum
columnae is equally rampant. The only restrained variety is
C. alpinum
lanatum, a compact grey-leaved Cerastium which forms neat mats, but it needs
protection against winter rain and is not really worth the
trouble.
SITE
& SOIL: Any well-drained soil - thrives best in full sun.
PROPAGATION:
Sow seeds or divide clumps in spring.
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