To Sow Directly
Abronia, Ageratum, Alonsoa, Alyssum, Anagallis, Antirrhinum, Arctotis, Baileya, Bellis, Brachycome, Calendula, Calliopsis, Canterburybells, Carnation, Centaurea, Cineraria, Clarkia, Cleome, Collinsia, Coreopsis, Cynoglossum, Delphinium, Dianthus, Dimorphotheca, Eschscholtzia, Flax, Gaillardia, Gilia, Godetia, Gypsophila, Kale, Larkspur, Linaria, Lunaria, Lupine, Malcomia, Mallow, Maurandia, Nasturtium, Nemesia, Nemophila, Nicotiana, Ornamental Cabbage, Pansies, Penstemon, Petunia, Phlox, Pinks, Poppies, Primula, Scabiosa, Schizanthus, Shasta Daisies, Stevia, Stock, Strawflower, Sweetpea, Verbena, Viola.
Plant out as full plants
Alyssum, Antirrhinum, Arctotis, Bellis, Brachycome, Calendula, Canterburybells, Centaurea, Cineraria, Clarkia, Coreopsis, Delphinium, Dimorphotheca, Gaillardia, Gypsophila, Heuchera, Iceland Poppy, Iberis, Lobelia, Mallow, Pansies, Stocks, Viola.
Seeds to plant on
Ageratum, Antirrhinum, Arctotis, Bellis, Brachycome, Calendula, Canterburybells, Carnation, Centaurea, Cineraria, Coreopsis, Cynoglossum, Delphinium, Dimorphotheca, Exacum, Forget-me-not, Gaillardia, Geum, Godetia, Gypsophila, Iberis, Iceland Poppy, Mallow, Mimulus, Nemesia, Pansies, Penstemon, Periwinkle, Petunia, Primula, Scabiosa, Stocks, Trachelium, Verbena, Viola.
Bulbs, Corms and Tubers
Allium, Alstroemeria, Anemone, Antholyza, Babiana, Bessera, Brunsvigia, Calochortus, Camassia, Clivia, Commelina, Dierama, Dipidax, Elisena, Freesia, Fritillaria, Galanthus, Gladiolus, Ixia, Lachenalia, Leucocoryne, Lycoris, Lilium, Moraea, Neomarica, Montbretia, Muscari, Narcissus, Ornithogalum, Oxalis, Pancratium, Ranunculus, Scilla, Bulbous Iris, Tritoma.
By Division/Splitting
Acanthus, Agapanthus, Alstroemeria, Amaryllis, Anchusa, Billbergia, Bletilla, Crinum, Dahlia, Dierama, Eremurus, Eryngium, Fall Asters, Gazania, Gerberia, Gloriosa, Heychium, Hemerocallis, Heuchera, Japanese Iris, Lilium, Neo-marica, Nerine, Orchid Iris, Oriental Poppy, Pancratium, Penstemon, Periwinkle, Romneya, Physostegia, Shasta Daisy, Stokesia, Tigridia, Tritoma, Veronica.
In the Veg Garden
Fruit trees, Garlic, Spring cabbages, Spinach, Oriental Vegetables, Beets, Chinese Cabbage, Carrots, Collards, Lettuce, Mustard, Parsley, Garden Peas, Spinach, Radishes and Turnips
If you have more ideas please post here!