Amaranthus x 'Aurora Summer Poinsettia' Amaranthus x 'Perfecta'
Amaranthus x 'Ritz Rocket' Amaranthus x 'Towers Mix'
Amaranthus erythoflexosa Amaranthus hypochondriacus
Amaranthus tricolor 'Aurora' Amaranthus tricolor 'Illumination'
Amaranthus tricolor 'Splendens Perfecta' Amaryllis belladonna
Amaryllis belladonna 'Alba' Amauropelta tetragona
Ammi visnaga 'Green Mist' Ammobium alatum 'Bikini'
Amorpha canescens Amorphophallus rivieri
Amsonia grandiflora Amsonia hubrichtii
Amsonia rigida Amsonia tabernaemontana
Amsonia tabernaemontana var. montana Amsonia tabernaemontana var. salicifolia
Anacyclus pyrethrum Anacyclus pyrethrum var. depressus
Anagallis monellii 'Blue Light' Ananas comosus
Ananas comosus 'Variegatus' Anaphalis margaritacea
Anchusa azurea 'Loddon Royalist' Andrachne colchica
Andropogon gerardii Androsace lanuginosa
Anemone blanda Anemone blanda 'Blue Shades'
Anemone canadensis Anemone coronaria
Anemone coronaria 'Mr. Fokker' Anemone coronaria 'The Bride'
Anemone hupehensis Anemone hupehensis 'Alice'
Anemone hupehensis 'September Charm' Anemone hupehensis var. japonica
Anemone hupehensis var. japonica 'Party Dress' Anemone hupehensis var. japonica 'Prince Henry'
Anemone x hybrida 'Alba' Anemone x hybrida 'Bressingham Glow'
Anemone x hybrida 'Honorine Jobert' Anemone x hybrida 'Margarete'
Anemone x hybrida 'Pamina' Anemone x hybrida 'Prince Henry'
Anemone x hybrida 'Whirlwind' Anemone magellanica
Anemone multifida 'Rubra' Anemone narcissiflora
Anemone nemorosa Anemone sylvestris
Anemone sylvestris 'Elise Feldman' Anemone tomentosa 'Robustissima'
Anemone virginiana Anemone vitifolia
Anemonella thalictroides Anemonopsis macrophylla
Angelica archangelica Angelica gigas
Angelonia angustifolia 'AngelMist™ Purple Stripe' Angelonia angustifolia 'Carita Deep Pink'
Angelonia angustifolia 'Carita Purple' Angelonia angustifolia 'Carita White'
Angelonia angustifolia 'Serena Purple' Angelonia angustifolia 'Serena White'
Angraecum sesquipedale Anguloa clowesii
Anguloa hybrida Anguloa uniflora
X Angulocaste X Angulocaste olympus 'Chadds Ford'
Anigozanthos flavidus Anigozanthos flavidus 'Red Cross'
Anigozanthos manglesii Anisodontea capensis
Anisodontea x hypomandarum Anisodontea lateritum
Anomatheca laxa Antennaria dioica 'Rubra'
Antennaria parvifolia Antennaria rosea
Anthemis punctata ssp. cupaniana Anthemis tinctoria
Anthemis tinctoria 'Kelwayi' Anthemis tinctoria 'Moonlight'
Anthemis tinctoria 'Sauce Hollandaise' Anthemis tinctoria 'Susanna Mitchell'
Anthemis tinctoria 'Wargrave' Anthriscus sylvestris 'RavensWing'