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Half hardy annuals are those types that are mostly sown in a greenhouse in early spring and planted outdoors after the frosts have finished.they are called half hardy because frost would kill them outright
Good examples are Begonia semperflorens,Petunia grandiflora,Verbena hybrida,Lobelia erinus and Antirrhinum majus.
Some quick growing types such as French Marigolds,African Marigolds and Zinnias can be sown direct outside in April/Maytime.