Ageratina 'Chocolate' Ageratum, Garden (spp.)
Ageratum, Garden 'Bavaria' Ageratum, Garden 'Blue Danube'
Ageratum, Garden 'Blue Horizon' Ageratum, Garden 'Hawaii White'
Ageratum, Garden 'Leilani Blue' Ageratum, Garden 'Purple Fields'
Ageratum, Garden 'Red Sea' Ageratum, Garden 'Shell Pink Hawaii'
Ageratum, Garden 'True Blue' Ageratum, Hardy
Ageratum, Yellow 'Agincourt Beauty' Common Lilac
'Agincourt' Venus' Slipper 'Aglaia' Shasta Daisy
Aglaonema Aglaonema: pictum
'Agnes' Rugose Rose Agrimony, Hemp
Agrimony: repens Aino Mulberry
Air Pine Air Pine 'Bert'
Airplane Plant Aizoon Saxifrage
Aizoon Stonecrop (spp.) Aizoon Stonecrop 'Aurantiacum'
'Aka Banayama' Hybrid Hydrangea: hybrid 'Aka kawa hime' Japanese Maple
'Aka shigitatsu sawa' Japanese Maple 'Akaha nishiki' Japanese Maple
Akebia, Fiveleaf Akebia, Threeleaf
'Akebono' Yoshino Cherry 'Akisho Temori' Sawtooth Hydrangea
'Akita yatsubusa' Japanese Maple Alabama Azalea
Alabaster Plant 'Alan Bloom' Tube Clematis
Alaska Cedar (spp.) Alaska Cedar 'Aureo-variegata'
Alaska Cedar 'Jubilee' Alaska Cedar Weeping
Alaska Fringecup (spp.) Alaska Fringecup 'Rubra'
'Alaska' Nasturtium 'Alaska' Shasta Daisy
'Alba Minor' Horned Violet 'Alba' Scarlet Plume
'Albaflora' Japanese Kerria Albanian Spurge (spp.)
Albanian Spurge 'Portuguese Velvet' Albany Bottlebrush
Albany Cycad Albany Daisy
Albardine 'Alba-variegata' Sweet Iris
'Alberta Park' Norway Maple Albertina Thatching Reed
'Albiflora' Japanese Spirea 'Albiflorus' Gas Plant
'Albo Strata' Hakone Grass 'Albovariegata' Little Club Moss
'Albu Marginatai' Bromeliad Albuca
'Alburyensis' Black Walnut 'Alcazar' Common Torch Lily: Kniphofia
Alcock's Spruce Alder Buckthorn 'Asplenifolia'
Alder, Beach Alder, Black (spp.)
Alder, Black 'Imperialis' Alder, Black 'Incisa'
Alder, Black 'Pyramidalis' Alder, Common (spp.)
Alder, Common 'Imperialis' Alder, Common 'Incisa'
Alder, Common 'Pyramidalis' Alder, Creek
Alder, European (spp.) Alder, European 'Imperialis'
Alder, European 'Incisa' Alder, European 'Pyramidalis'
Alder, Formosan Alder, Grey 'Cut Leaf'
Alder, Grey Weeping Alder, Japanese
Alder, Manchurian Alder, Mountain
Alder, Oriental Alder, Speckled 'Cut Leaf'
Alder, Speckled Weeping Alder, Thinleaf 'Cut Leaf'
Alder, Thinleaf Weeping Alder, White
Alder, Yellow (spp.) Alder: acuminata, White
Alder: ulmifolia angustifolia, Yellow Alder: verticillata, Black (spp.)
Alder: verticillata, Black 'Afterglow' Alder: verticillata, Black 'Aurantiaca'
Alder: verticillata, Black 'Berry Heavy® Gold' Alder: verticillata, Black 'Berry Poppins™'
Alder: verticillata, Black 'Cacapon' Alder: verticillata, Black 'Chrysocarpa'
Alder: verticillata, Black 'Early Bright' Alder: verticillata, Black 'Fairfax'
Alder: verticillata, Black 'Jolly Red' Alder: verticillata, Black 'Little Goblin™'
Alder: verticillata, Black 'Scarlett O'Hara' Alder: verticillata, Black 'Shaver'
Alder: verticillata, Black 'Sunsplash' Alder: verticillata, Black 'Winter Gold'
Alder: verticillata, Black 'Winter Red'