Hardy Biennials

Biennials differ from annuals in asmuch as they mature and die in the year following the sowing of the seed. In general practice the seed should be sown as described for autumn-sown annuals, although where it is possible the seed may be sown earlier, even in June, to produce strong plants for planting out in their permanent positions by late summer or early autumn. The wallflower, probably the most popular of all biennials, provides a good example of a plant where such early sowing is imperative if plants, sufficiently large and vigorous to provide a first-class display, are to be produced for early autumn planting.

The same precepts as those given for the general cultivation of annuals apply in the main to biennials.