Not only are perennials selected because of the colours of the flowers and other characteristics such as good blooming combinations, perpetual bloom, and good flowers, as shown in the following groups, but many times certain types are selected because of their long blooming period. Such plants as the yellow marguerite, the Shasta daisy, the blanket flower, and certain hardy phloxes, are very valuable in the garden because they produce flowers over a long blooming period, extending in instances for three or four weeks. Some of these plants require cutting back, like the larkspurs and nettle-leaved mulleins, thus causing them to produce a second crop of bloom. They are all useful to insure a bridging of the gaps between the flowering period of other sorts or to plant in those places where only one, or at most a few sorts, can be used. The tickseed, the Shasta daisy, the blanket flower, and the scabiosa all carry their bloom at intervals from June until frost, while the violet, the forget-me-not, and the toad-flax start in May and last until well into August.

Achillea ptarmica flore pleno

Double Tansy Anthemis tinctoria kelwayi

Hardy Marguerite Campanula carpatica

Carpathian Harebell Chrysanthemum maximum King Edward

Large Shasta Daisy

Coreopsis lanceolata Tickseed

Delphinium (in variety) Larkspur

Dianthus deltoides

Maiden Pink Gaillardia aristata

Blanket Flower Geum coccineum

Avens

Heuchera brizoides Red Coral-bells

Knifophia uvaria Red-hot Poker Plant

Lathyrus latifolius Hardy Sweet Pea

Linaria dalmatica Dalmatian Toad-flax

Lychnis coronaria Mullein Pink

Myosotis palustris semperflorens Forget-me-not

Oenothera fruticosa youngi Young's Evening Primrose

Papaver nudicaule Iceland Poppy'

Phlox glabsrrima suffruticosa Early Garden Phlox

Scabiosa graminifolia Grass-leaved Scabiosa

Scabiosa sylvatica Woodland Scabiosa

Tradescantia virginica

Common Spiderwort Verbascum (in variety)

Nettle-leaved Mullein

Viola cornuta Tufted Pansy