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Hardy annuals can be sown directly into their flowering positions in the spring and will tolerate a certain amount of cold. Well-known flowers such as sweet peas, poppies, stocks and sunflowers fall under this category, as do some of the more unusual flowers - gomphocarpus & ratibida for example.
Tansy-leaf Aster, Aster tanacetifolius, Tahoka Daisy, Prairie Aster
Looks like a perennial Michaelmas Daisy, but is an annual producing a mass of violet-blue single flowers during the summer. Also known as Prairie Aster it blooms over a long period adding late summer to early autumn colour to borders. Attractive addition to large containers on a sunny patio.More info
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