Biennials
These plants take two years to flower, and then they dieaway altogether. The seed of the hardy varieties is sown thinly in the open border any time between April and June, and the plants transferred i...
the open border any time between April and June, and the plants
transferred in the autumn to the place where they are intended to
bloom. Seed is also sown in August and September for flowering the
following year. The half-hardy kinds may be sown in May or June. These
require protection during winter, such as is afforded by a cold pit,
frame, or greenhouse, or the covering of a mat or litter.
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