_Hardy_.--The seed should be sown thinly in the open borders
during March, April, or May in fine soil, covering slightly with
well-prepared mould--very small seeds require merely a dusting over
them. When the plants are large enough to handle, thin them out
boldly, to allow them to develop their true character. By this means
strong and sturdy plants are produced and their flowering properties
are enhanced. Many of the hardy annuals may be sown in August and
September for spring flowering, and require little or no protection
from frost.