Alopecurus pratensis 'Aureovariegatus' Alopecurus pratensis 'Variegata'
Aloysia triphylla Alpinia formosana
Alpinia zerumbet Alpinia zerumbet 'Variegata'
Alstonia constricta Alstroemeria x 'Freedom'
Alstroemeria x 'Jazze Rose Frost' Alstroemeria x 'Petite Plum'
Alstroemeria x 'Sweet Laura' Alstroemeria x 'Walter Fleming'
Alstroemeria aurea Alstroemeria haemantha
Alstroemeria hookeri Alstroemeria ligtu
Alstroemeria psittacina Alstroemeria psittacina 'Variegata'
Alternanthera 'Red Threads' Alternanthera 'Snow Queen'
Alternanthera dentata 'Party Time' Alternanthera dentata 'Rubiginosa'
Alternanthera dentata 'Ruby' Alternanthera ficoidea
Alternanthera ficoidea 'Big Red' Alternanthera ficoidea 'Brilliant'
Alternanthera ficoidea 'Party Time' Althaea officinalis
Alyogyne huegeli Alyogyne huegeli 'Santa Cruz'
Alyssum montanum 'Mountain Gold' Alyssum spinosum
Amaranthus x 'Aurora Summer Poinsettia' Amaranthus x 'Intensa Pink'
Amaranthus x 'Perfecta' Amaranthus x 'Ritz Rocket'
Amaranthus x 'Towers Mix' Amaranthus caudatus
Amaranthus caudatus 'Dreadlocks' Amaranthus caudatus 'Viridis'
Amaranthus cruentus Amaranthus cruentus 'Golden Giant'
Amaranthus erythoflexosa Amaranthus hypochondriacus
Amaranthus hypochondriacus 'Burgundy' Amaranthus hypochondriacus 'Pygmy Torch'
Amaranthus retroflexus Amaranthus tricolor 'Aurora'
Amaranthus tricolor 'Illumination' Amaranthus tricolor 'Molten Fire'
Amaranthus tricolor 'Splendens Perfecta' Amaranthus tricolor var. salicifolius
Amaranthus tricolor var. salicifolius 'Early Splendor' Amaranthus tricolor var. salicifolius 'Flaming Fountain'
Amaranthus tricolor var. salicifolius 'Joseph's Coat' Amaryllis belladonna
Amaryllis belladonna 'Alba' Amauropelta tetragona
Ambrosia artemisiifolia Ambrosia deltoidea
Ambrosia trifida Amelanchier x
Amelanchier x 'Prince William' Amelanchier alnifolia
Amelanchier alnifolia 'Regent' Amelanchier arborea
Amelanchier canadensis Amelanchier canadensis 'Tradition'
Amelanchier x grandiflora Amelanchier x grandiflora 'Autumn Brilliance'
Amelanchier x grandiflora 'Cole's Select' Amelanchier x grandiflora 'Princess Diana'
Amelanchier x grandiflora 'Robin Hill' Amelanchier x grandiflora 'Strata'
Amelanchier laevis Amelanchier laevis 'Cumulus'
Amelanchier laevis 'Lancifolia' Amelanchier lamarckii
Amelanchier obovalis 'Jennybelle' Amelanchier ovalis 'Pumila'
Ammi majus Ammi visnaga 'Green Mist'
Ammobium alatum 'Bikini' Amorpha canescens
Amorpha fruticosa Amorpha nana
Amorphophallus rivieri Ampelopsis brevipedunculata
Ampelopsis brevipedunculata 'Elegans' Amphitecna latifolia
Amsonia grandiflora Amsonia hubrichtii
Amsonia rigida Amsonia tabernaemontana
Amsonia tabernaemontana var. montana Amsonia tabernaemontana var. salicifolia
Anacardium occidentale Anacyclus pyrethrum
Anacyclus pyrethrum var. depressus Anagallis monellii 'Blue Light'