Armenian Geranium (spp.) Armenian Geranium 'Bressingham Flair'
Arnica, Leafy Aroid Palm
Aromatic Ginger Arrowgrass, Sea
Arrowhead 'Flore Pleno' Arrowhead Plant 'White Butterfly'
Arrowhead Vine 'White Butterfly' Arrowhead, Broadleaf (spp.)
Arrowhead, Broadleaf 'Bloomin' Baby' Arrowhead, Grassy 'Crushed Ice'
Arrowhead, Longbeak 'Silk Stockings' Arrowroot
Arroz de Costa Artemisia, Louisiana (spp.)
'Arthur Menzies' Fleabane: glaucus Artichoke (spp.)
Artichoke Thistle Artichoke 'Imperial Star'
Artichoke 'Large Green Globe' Artillery Plant (spp.)
Artillery Plant 'Florentinum' Artillery Plant 'Herman's Pride'
Artillery Plant Variegated Artillery Plant: microphylla
'Artist® Blue' Floss Flower: hybrid 'Artist® Blue Violet' Floss Flower: hybrid
'Artist® Purple' Floss Flower: hybrid 'Artist® Rose' Floss Flower: hybrid
Arum Fern Arum Lily
Arum, Green Arrow (spp.) Arum, Italian (spp.)
Arum, Italian 'Pictum' Arum, Umbrella (spp.)
Arum, Water (spp.) Arum, White Arrow
Asa Gray Sedge 'Asao' Hybrid Clematis
Asarabacca (spp.) 'Ashley' Florist's Chrysanthemum
'Ashwood Garden Strain' Hellebore: sterniihybrid 'Ashwood Strain' Lewisia
Asian Crocus Asiatic Lily (spp.)
Asiatic Lily 'America' Asiatic Lily 'Bright Star'
Asiatic Lily 'Esperanto' Asiatic Lily 'Gardenia'
Asiatic Lily 'Imperial Star' Asiatic Lily 'Marco Polo'
Asiatic Lily 'Roma' Asiatic Lily 'Stargazer'
'Asiatic White' Sacred Lotus Asparagus
Asparagus Fern 'Myers' Asparagus Fern 'Sprengeri'
Asparagus Fern: setaceus Asparagus, Foxtail 'Myers'
Asparagus, Foxtail 'Sprengeri' Aspen, Daisy 'Dignity'
Aspen, Daisy 'Prosperity' Asphodel, False
Asphodel, Yellow (spp.) Aster 'Pink Bouquet'
Aster 'White Opal' Aster, Alpine 'Roseus'
Aster, Alpine White Aster, Beach 'Arthur Menzies'
Aster, Beach 'Cape Sebastian' Aster, Bushy 'Bonny Blue'
Aster, Bushy 'Lady in Blue' Aster, Bushy 'Persian Rose'
Aster, Bushy 'Peter Harrison' Aster, Bushy 'Rose Serenade'
Aster, Bushy 'Sapphire' Aster, Bushy 'Snow Cushion'
Aster, Bushy 'Snow Flurry' Aster, Bushy 'Winston Churchill'
Aster, Bushy 'Wood's Light Blue' Aster, Bushy 'Wood's Pink'
Aster, Calico 'Lady in Black' Aster, Calico 'Prince'
Aster, Double Japanese 'Shogun' Aster, East Indies (spp.)
Aster, East Indies 'Wartburg Star' Aster, East Indies 'Wartburgstern'
Aster, Frikart's (spp.) Aster, Frikart's 'Flora's Delight'
Aster, Golden Aster, Japanese (spp.)
Aster, Japanese 'Hortensis' Aster, Michaelmas (spp.)
Aster, Michaelmas 'Frolic' Aster, Michaelmas 'Henry III'
Aster, Michaelmas 'Marie III' Aster, Michaelmas 'Patricia Ballard'
Aster, Michaelmas 'Peter III' Aster, Michaelmas 'Shout'
Aster, Michaelmas 'Twist' Aster, New England (spp.)
Aster, New England 'Alert' Aster, New England 'Alma Potschke'
Aster, New England 'Bressingham Pink' Aster, New England 'Purple Dome'
Aster, New England 'Red Star' Aster, New England 'Treasurer'
Aster, New York (spp.) Aster, New York 'Frolic'
Aster, New York 'Henry III' Aster, New York 'Marie III'
Aster, New York 'Patricia Ballard' Aster, New York 'Peter III'
Aster, New York 'Shout' Aster, New York 'Twist'
Aster, Orcutt Aster, Stokes' (spp.)
Aster, Stokes' 'Blue Danube' Aster, Stokes' 'Honeysong Purple'
Aster, Stokes' 'Klaus Jelitto' Aster, Stokes' 'Mary Gregory'
Aster, Stokes' 'Omega Skyrocket' Aster, Stokes' 'Purple Parasols'
Aster, Stokes' 'Silver Moon' Aster, Tartarian (spp.)
Aster, Thousand Flower 'Pink Beauty' Aster, Thousand Flower 'Snowbank'
Aster, Thousand Flower 'Snowflake' Aster, Wild 'Pink Beauty'
Aster, Wild 'Snowbank' Aster, Wild 'Snowflake'
Aster: incisa, Japanese Aster: spp.
Astericus (spp.) Aster-Like Boltonia 'Pink Beauty'
Aster-Like Boltonia 'Snowbank' Aster-Like Boltonia 'Snowflake'