Arabian Aloe Arabian Cotton 'Nigra'
Arabian Violet (spp.) Arabian Violet 'Tiddly Winks'
'Arabicus' Dwarf Lilyturf 'Arabicus' Mondo Grass
Arbutus, Trailing Archangel
Archangel, Yellow (spp.) Archangel, Yellow 'Florentinum'
Archangel, Yellow 'Herman's Pride' Archangel, Yellow Variegated
'Archer's Gold' Lemon-Scented Thyme Arctic Bramble
'Arctic Fire' Maiden Pink 'Arctic Fury' Tall Bearded German Iris
'Arctic Glow' Globe Thistle Arctic Polemonium 'Heavenly Habit'
Arctic Poppy (spp.) Arctic Poppy 'Champagne Bubbles'
Arctic Poppy 'Wonderland Mix' 'Arctic Summer' Silver Mullein
Arend's Phlox 'Anja' Arend's Saxifrage 'Triumph'
'Argent' Mealycup Sage 'Argenteus' Garden Thyme
Argentine Blue-eyed Grass Argentine Rain Lily (spp.)
Argentine Rain Lily 'Russell Manning' Argyranthemum
Aristea 'Aristocrat' Daylily
'Aristocrat' Hosta Arizona Blue Star
Arizona Sliprod 'Arizona Sun' Blanket Flower
Arizona Yucca Arkwright's Campion 'Orange Gnome'
Arkwright's Campion 'Vesuvius' Arkwright's Catchfly 'Orange Gnome'
Arkwright's Catchfly 'Vesuvius' 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 Arroyo Lupine
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