Below is a list of hardy (cool) and tender (warm) annual flowers. Cool annuals are frost hardy to the mid twenties and can be planted starting in mid-March. Warm flowers can be damaged by frost at 32 degrees. They do not make much growth until temperatures reach into the 70’s. It is better to wait until mid-May or later to plant them in the Pacific Northwest. Perennial flowers are all hardy and can be planted as soon as they become available.
Hardy (Cool) Annuals
Alyssum, Candytuft, Carnation, Cleome, Dianthus, Dusty Miller, Gazania, Godetia, Hollyhock, Lobelia, Nasturtium, Nierembergia, Pansy, Petunia, Poppy, Blue Salvia, Snapdragon, Sweet Pea, Viola
Tender (Warm) Annuals
Aster, Begonia, Celosia, Cosmos, Dahlia, Geranium, Impatiens, Marigold, Moss Rose, Nicotiana, Phlox, Scarlet Salvia, Schizanthus, Stock, Verbena, Vinca, Zinnia