'Ames' Kalm St. Johnswort 'Amethyst Falls' American Wisteria
'Amethyst' Japanese Wisteria 'Amethyst™' Snowberry
'Ami Schott' Lilac 'Amity Wilson' Japanese Camellia
Amur Choke Cherry Amur Corktree (spp.)
Amur Corktree 'Macho' Amur Honeysuckle
Amur Maackia Amur Maackia: amurensis
Amur Maple (spp.) Amur Maple 'Acontifolium'
Amur Maple 'Green Cascade' Amur Maple 'Vitifolium'
Amur Mountain Ash Amur Peppervine (spp.)
Amur Peppervine 'Elegans' 'Amy Cotta' Rhododendron: (n)
'Anabel' Lilac: hyacinthiflorahybrid Anacahuita
Ana-tree 'Andelyensis' Atlantic White Cedar
Anderson Wolfberry Anderson's Desert Thorn
Andromeda, Chinese Andromeda, Japanese (spp.)
Andromeda, Japanese 'Compacta' Andromeda, Japanese 'Dorothy Wycoff'
Andromeda, Japanese 'Little Heath' Andromeda, Japanese 'Mt. Fire'
Andromeda, Japanese 'Valley Rose' Andromeda, Japanese Variegated
Anemone, Bush (spp.) Anemone, Tree (spp.)
Angel Wing Jasmine Angelica Tree (spp.)
Angelica Tree 'Silver Umbrella' Angelica Tree Variegated
Angelica Tree, American Angelica Tree, Japanese (spp.)
Angelica Tree, Japanese 'Silver Umbrella' Angelica Tree, Japanese Variegated
Angel's Hair Angel's Trumpet (spp.)
Angel's Trumpet Variegated Peach Angel's Trumpet, Red
Angel's Trumpet: Brugmansia 'Pink' Angel's Trumpet: Brugmansia 'Tricolor'
Angel's Trumpet: spp. Anglojapanese Yew (spp.)
Anglojapanese Yew 'Brownii' Anglojapanese Yew 'Burr'
Anglojapanese Yew 'Densiformis' Anglojapanese Yew 'Farmen'
Anglojapanese Yew 'Hatfieldii' Anglojapanese Yew 'Helen Corbit'
Anglojapanese Yew 'Heleri' Anglojapanese Yew 'Henryi'
Anglojapanese Yew 'Hicksii' Anglojapanese Yew 'Pilaris'
Anglojapanese Yew 'Thayerae' Anglojapanese Yew 'Vermeulen'
Anglojapanese Yew 'Wardii' 'Animation' Azalea
Anise Anise Magnolia (spp.)
Anise Magnolia 'Miss Jack' Anise Tree, Japanese
Anise, Chinese Anise, Florida (spp.)
Anise, Florida 'Haley's Comet' Anise, Henry
Anise, Japanese Star Anise, Purple (spp.)
Anise, Purple 'Haley's Comet' Anise, Star (spp.)
Anise, Star 'Haley's Comet' Anise: floridanum alba, Purple
'Ann Bidwell' Summer Sweet 'Ann' Magnolia
'Ann Rutledge' Sugar Maple 'Annabelle' Smooth Hydrangea: arborescens
'Anna's Magic Ball™' American Arborvitae Annatto
'Anne Marie' English Ivy Antartic Beech
'Anzac' Red Bottlebrush 'Aoba jo' Japanese Maple
'Aoyagi' Japanese Maple Apache Pine
Apache Plume 'Apalachee' Crapemyrtle
Aphananthe 'Aphrodite' Rose of Sharon
'Aphrodite' Sweetshrub: Calycanthus 'Apollo' Magnolia
'Apollo' Oregon Holly Grape