'Arbuscula' Shrubby Cinquefoil 'Arch McKean' Lilac
'Arctic Fire™' Red Osier Dogwood 'Argenteo-Marginata' White Dogwood
Arizona Mesquite Arizona Rosewood
'Armande' Rose of Sharon 'Arneson Cameo' Azalea
'Arneson Flame' Azalea 'Arneson Gem' Azalea
'Arnold's Promise' Witchhazel: intermediahybrid Arolla Pine Dwarf
Arolla Pine 'Pygmaea' 'Aromas' Spider Flower
Aronia, Black Berried 'Low Scape® Mound' Aronia, Black Berried 'Viking'
'Arp' Rosemary Arrayan
Arrowroot, Florida Arrowwood Viburnum (spp.)
Arrowwood Viburnum 'Blue Muffin®' Arrowwood, Japanese
Arrowwood, Southern (spp.) Arrowwood, Southern 'Blue Muffin®'
'Arthur J. Simmonds' Blue Mist Spirea 'Artic Sun™' Blood Twig Dogwood
'Asessippi' Lilac: hyacinthiflorahybrid Ash Plant (spp.)
Ash Plant 'Compactum' Ash, Blueberry
Ash, Mountain Ash, Wafer (spp.)
Ash, Wafer Golden Ash: multijuga, Mountain
Ashanti Blood Ashe Magnolia
'Ashfordii' Common Juniper Ashy Hydrangea (spp.)
Ashy Hydrangea 'Annabelle' Ashy Hydrangea 'Grandiflora'
Ashy Hydrangea 'Incrediball®' Ashy Hydrangea 'Invincibelle® Spirit'
Ashy Hydrangea 'White Dome®' 'Asplenifolia' Alder Buckthorn
'Atheline Wilbur' Lilac 'Athens' Carolina Allspice
Atlantic White Cedar 'Andelyensis' Atlantic White Cedar 'Conica'
Atlantic White Cedar 'Ericoides' Atlantic White Cedar 'Heatherbun'
'Atropurpurea' Harry Lauder's Walking Stick 'Atropurpurea' Japanese Barberry
'Atropurpurea Nana' Japanese Barberry 'Attraction' Butterflybush
Aucuba 'Rozannie' Aucuba, Japanese (spp.)
Aucuba, Japanese 'Gold Dust' Aucuba, Japanese 'Mr. Goldstrike'
Aucuba, Japanese 'Picturata' Aucuba, Japanese Variegated
Aucuba, Narrow Leaf Japanese 'Aurantiaca' Winterberry: verticillata
'Aurantiacum' Tea Viburnum 'Aurea Densa' Lawson's Cypress
'Aureomarginata' Black Elderberry 'Aureopicta' Bush Ivy
'Aureovitla' Japanese Kerria 'Aurora' Koreanspice Viburnum
Australia Acacia Australia Flame Pea
Australian Fuchsia Australian Fuchsia: pulchella
Australian Laurel (spp.) Australian Laurel 'Creme De Menthe'
Australian Laurel 'Turners Dwarf' Australian Laurel Variegated
Australian Mintbush Australian Rosemary (spp.)
Australian Rosemary 'Zena' Australian Saltbush
Australian Tea Tree 'Reevesii' Australian Tree Fern
Austrian Briar Rose 'Bicolor' Austrian Yellow Rose 'Bicolor'
'Autumn Embers' Vernal Witchhazel 'Autumn Moon' Fullmoon Maple: shirasawanum
Autumn Sage (spp.) Autumn Sage 'Chiffon'
Autumn Sage 'Moonlight' Autumn Sage 'Purple'
Autumn Sage 'Raspberry Ripple' Autumn Sage 'Red'
Autumn Sage 'San Isidro Moon' 'Autumnale' Fuchsia
Awl Tree 'Ayesha' Bigleaf Hydrangea