The following selection of half-hardy (frost tender) flowering annuals are suitable for most domestic gardens and outdoor flowering displays during the summer months in the UK, and other northern temperate climates.
Most of these plants will not survive low or freezing temperatures, so they should not be planted outside until all chance of frost has passed in your area - such as the end of May in the south and the beginning of June in the north. Plants propagated indoors (under glass) will also need to be gradually hardened-off (acclimatised to outdoor temperatures) before planting out.
Love lies bleeding
Swan River Daisy
Marvel of Peru
Bells of Ireland
Many annuals grown in the UK are actually short lived tender perennials, which are usually grown as annuals because they flourish and flower very quickly from seed (sown under protection) in spring. Many of these species will actual survive over-winter in the UK if kept in light and cool but frost free conditions.