Alaska Shasta Daisy (Leucanthemum X superbum ‘Alaska’)

Hardiness zone: 4, 5, 6, 7, 8, 9

Growth rate: Fast

Albomarginata Hosta (Hosta undulata ‘Albomarginata’)

Hardiness zone: 3, 4, 5, 6, 7, 8

Growth rate: Fast

Alderleaf Mountain Mahogany (Cercocarpus montanus)

Hardiness zone: 5, 6, 7, 8, 9, 10

Growth rate: Slow

Alsike Clover (Trifolium hybridum)

Hardiness zone: 5, 6, 7, 8, 9

Growth rate: Fast

Alternate Leaf Butterfly Bush (Buddleja alternifolia)

Hardiness zone: 5, 6, 7, 8, 9

Growth rate: Medium

Amazing Daisies ‘Spun Silk’ Shasta Daisy (Leucanthemum superbum)

Hardiness zone: 5, 6, 7, 8, 9

Growth rate: Medium

Amazing Grace Tulip (Tulipa ‘Amazing Grace’)

Hardiness zone: 3, 4, 5, 6, 7

Growth rate: Fast

American Smoke Tree (Cotinus obovatus)

Hardiness zone: 3, 4, 5, 6, 7, 8

Growth rate: Slow

Amethyst Kiss Spiderwort (Tradescantia ‘Radtrad’)

Hardiness zone: 3, 4, 5, 6, 7, 8, 9

Growth rate: Medium