Thee plants bloom every other year - hence the term "biennal," two years for the plant's cycle. They vary according to zone. Some are edible, such as parsley and chard. Others you may want for purely decorative purposes, such as Sweet William in it's variety of pink shades.
Sweet William, Hollyhock, Pansies, Foxglove, Queen Anne's Lace are some of the most popular biennials. Be careful when planting these as they can be very invasive and can overrun all the other plants in your garden.
Main examples of these type of flowers are evening primrose, caraway, angelica, black eyed susan, sweet william, holly hock, queen anne's lace, wallflower, verbena , pansy , foxglove , myosotis etc
