Hardy perennial
Penstemons when grown as half-hardy annuals are a valuable addition to
beds and borders, where they produce a brilliant effect in summer. In
borders it is not advisable to plant singly, but they should be employed
in groups of not less than
one dozen. It is also important to sow a
strain consisting principally of scarlet and pink shades with white
markings, as well as white flowers; under fair conditions there will be
a profusion of richly coloured blooms on stately spikes about two feet
high. Sow in heat during February or March and plant out in genial
weather. It is not necessary to keep them after flowering has finished,
although seedling Pentstemons on comparatively dry soil in favourable
districts scarcely feel the winter. Seed may also be sown in June, in
the manner usual with hardy perennials, and the plants will bloom in
advance of those which are spring-sown.
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