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Rock Garden Plants A to Z:
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Oenothera- (Evening Primrose)
Oenothera acaulis |
A large American genus with a few species which are short enough
to grow in the rock garden. The silky cupped blooms are remarkably large
for such low-growing plants, but these yellow or white flowers generally
open in the evening and close at dawn. Oenothera is not a long-lived plant,
but it does produce a fine display if plentifully supplied with sun, and
sand and an adequate amount of water in dry weather. Cut back stems in late
autumn.
VARIETIES:
The largest blooms, 4 in. or more across, are borne by the trailing
O.
missouriensis
(Ozark
Sundrops). The basic details are height 6 in., spread 1-1/2 ft., flowering
period July-September. The yellow flowers are borne above the sprawling stems.
O.acaulis is more temperamental but is considered by many experts to be a
better plant. White flowers (2-3 in. across) which turn pink with age appear
above the Dandelion-like leaves.
O.
caespitosa (4 in.high) has similarly colored flowers, but the petals are
notched.
SITE
& SOIL:
Requires well-drained open soil - thrives in full sun.
PROPAGATION:
Sow seeds under glass in spring.
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