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Abutilon 'Boule de Neige'
Abutilon 'Jacqueline Morris'
Abutilon 'Marion' AGM
Abutilon 'Nabob' AGM
Abutilon 'Souvenir de Bonn' (v) AGM
Acanthus spinosus L. AGM
Achillea clavennae
Achillea 'Credo' AGM
Achillea 'Faust'
Achillea 'Feuerland'
Achillea filipendulina 'Gold Plate' AGM
Achillea 'Gold and Grey'
Achillea 'Marmalade'
Achillea millefolium 'Red Beauty'
Achillea millefolium 'Red Velvet'
Achillea millefolium 'Rose Madder'
Achillea 'Moonshine' AGM
Achillea 'Paprika' (Galaxy Series)
Achillea 'Schwefelblüte'
Achillea 'Summerwine' AGM
Achillea 'Terracotta'
Achillea 'Walther Funcke'
Acis autumnalis AGM
Aconitum carmichaelii
Aconitum carmichaelii (Arendsii Group) 'Arendsii' AGM
Aconitum carmichaelii (Wilsonii Group) 'Barker's Variety'
Aconitum carmichaelii (Wilsonii Group) 'Kelmscott' AGM
Aconitum carmichaelii (Wilsonii Group) 'Spätlese'
Aconitum napellus 'Rubellum'
Acorus gramineus 'Oborozuki' (v)
Acorus gramineus 'Ogon' (v)
Acorus gramineus 'Variegatus' (v)
Actaea cordifolia
Actaea simplex (Atropurpurea Group) 'Brunette' AGM
Actaea simplex Atropurpurea Group
Actaea simplex 'Pink Spike'
Adenophora liliifolia
Adonis multiflora 'Sandanzaki' (d)
Aeonium arboreum AGM
Aeonium 'Zwartkop' AGM
Agapanthus Ardernei hybrid
Agapanthus 'Black Pantha' (PBR)
Agapanthus 'Blue Baby' Rom.
Agapanthus 'Blue Moon'
Agapanthus 'Blue Triumphator'
Agapanthus 'Castle of Mey'
Agapanthus coddii
Agapanthus 'Donau'
Agapanthus 'Flore Pleno' (d)
Agapanthus 'Gayle's Lilac'
Agapanthus Headbourne hybrids
Agapanthus inapertus
Agapanthus 'Jack's Blue'
Agapanthus 'Lady Moore'
Agapanthus 'Lilliput'
Agapanthus 'Mooreanus' misapplied
Agapanthus 'Purple Cloud'
Agapanthus 'Snowdrops'
Agapanthus 'Streamline'
Agapanthus 'Timaru'
Agapanthus 'Tinkerbell' (v)
Agapanthus 'Underway'
Agapanthus white dwarf hybrids
Agapanthus 'White Heaven' (PBR)
Agastache 'Black Adder'
Agastache 'Blue Fortune' AGM
Agastache cana 'Purple Pygmy'
Agastache 'Firebird'
Agastache mexicana
Agastache mexicana 'Marchants Pink'
Agastache mexicana 'Red Fortune' (PBR)
Agastache 'Painted Lady'
Agastache rugosa f. albiflora 'Liquorice White'
Agastache 'Tangerine Dreams' AGM
Ageratina altissima 'Chocolate' AGM
Alchemilla mollis AGM
Allium caeruleum AGM
Allium carinatum subsp. pulchellum AGM
Allium carinatum subsp. pulchellum f. album AGM
Allium cristophii AGM
Allium flavum AGM
Allium flavum 'Blue Leaf'
Allium giganteum AGM
Allium 'Gladiator' AGM
Allium hollandicum 'Purple Sensation' AGM
Allium karataviense AGM
Allium karataviense 'Ivory Queen'
Allium moly
Allium oreophilum
Allium roseum
Allium schubertii
Allium senescens
Allium sphaerocephalon
Allium stipitatum 'Mount Everest'
Allium tuberosum
Aloysia citrodora AGM
Alstroemeria aurea 'Orange King'
Alstroemeria 'Hawera'
Alstroemeria presliana subsp. australis
Alstroemeria psittacina 'Royal Star' (v)
Amaryllis belladonna AGM
Amicia zygomeris
Ammi majus
Amsonia hubrichtii
Amsonia orientalis
Amsonia tabernaemontana
Anaphalis triplinervis AGM
Anchusa azurea 'Dropmore'
Anchusa azurea 'Loddon Royalist' AGM
Androsace lanuginosa AGM
Anemanthele lessoniana AGM
Anemone blanda blue-flowered
Anemone blanda 'Charmer'
Anemone blanda pink-flowered
Anemone blanda 'White Splendour' AGM
Anemone blanda white-flowered
Anemone hupehensis var. japonica 'Prinz Heinrich' AGM
Anemone hupehensis var. japonica 'Rotkäppchen'
Anemone multifida 'Major'
Anemone multifida 'Rubra'
Anemone nemorosa 'Blue Bonnet'
Anemone nemorosa 'Dee Day'
Anemone nemorosa 'Rosea'
Anemone ranunculoides AGM
Anemone sylvestris 'Macrantha'
Anemone x hybrida 'Andrea Atkinson'
Anemone x hybrida 'Elegans' AGM
Anemone x hybrida 'Honorine Jobert' AGM
Anemone x hybrida 'Königin Charlotte' AGM
Anemone x hybrida 'Serenade'
Anemone x hybrida 'Whirlwind'
Anemone x lipsiensis
Anemone x lipsiensis 'Pallida' AGM
Angelica gigas
Angelica pachycarpa
Anisodontea capensis
Anisodontea capensis 'Tara's Pink'
Anthemis 'Cally Cream'
Anthemis marschalliana
Anthemis punctata subsp. cupaniana AGM
Anthemis sancti-johannis
Anthemis SUSANNA MITCHELL 'Blomit'
(other names: Anthemis 'Blomit' (accepted), Anthemis 'Suzanna Mitchell' (ortho), Anthemis 'Anna Mitchell' (ortho))
Anthemis tinctoria 'E.C. Buxton'
Anthemis tinctoria 'Lemon Maid'
Anthemis tinctoria 'Sauce Hollandaise'
Anthemis tinctoria subsp. tinctoria
Anthericum ramosum
Anthriscus sylvestris 'Ravenswing'
Aquilegia atrata
Aquilegia 'Blue Jay' (Songbird Series)
Aquilegia canadensis 'Pink Lanterns'
Aquilegia chrysantha 'Yellow Queen'
Aquilegia 'Dove' (Songbird Series) AGM
Aquilegia flabellata 'Georgia' (State Series) AGM
Aquilegia flabellata var. pumila f. alba AGM
Aquilegia fragrans
Aquilegia 'Heavenly Blue'
Aquilegia 'Leprechaun Gold' (v)
Aquilegia 'Louisiana' (State Series) AGM
Aquilegia 'Robin' (Songbird Series)
Aquilegia vulgaris var. alba
Aquilegia vulgaris var. flore-pleno 'White Bonnet' (d)
Aquilegia vulgaris var. stellata 'Black Barlow' (Barlow Series) (d)
Aquilegia vulgaris var. stellata 'Christa Barlow' (Barlow Series) (d)
Aquilegia vulgaris var. stellata 'Greenapples' (d)
Aquilegia vulgaris 'William Guiness'
Aquilegia 'Winky Blue-White' (Winky Series)
Aquilegia 'Winky Rose-Rose' (Winky Series)
Arctotis 'Hello'
Arctotis x hybrida hort. 'Apricot'
Arctotis x hybrida hort. 'China Rose'
Arctotis x hybrida hort. 'Flame' AGM
Arctotis x hybrida hort. 'Red Devil'
Arctotis x hybrida hort. 'Wine'
Argyranthemum 'Julieanne'
Argyranthemum POLLY 'Innpolly' (PBR)
(other names: Argyranthemum 'Innpolly' (PBR) (accepted))
Arisarum proboscideum
Artemisia alba 'Canescens' AGM
Artemisia lactiflora AGM
Artemisia ludoviciana 'Silver Queen' AGM
Artemisia ludoviciana subsp. mexicana var. albula
Artemisia 'Powis Castle' AGM
Artemisia schmidtiana 'Nana' AGM
Artemisia stelleriana 'Boughton Silver'
Arum italicum subsp. italicum 'Marmoratum' AGM
Aruncus dioicus 'Kneiffii'
Aruncus 'Misty Lace'
Asarum splendens
Asclepias incarnata
Asphodeline lutea
Asphodelus aestivus
Asplenium scolopendrium AGM
Astelia nervosa 'Westland'
Aster amellus 'Blue King'
Aster amellus 'Brilliant'
Aster amellus 'Sonora'
Aster 'Climax' ambig.
Aster 'Coombe Fishacre' AGM
Aster divaricatus
Aster ericoides 'Esther'
Aster ericoides f. prostratus 'Snow Flurry' AGM
Aster laevis 'Calliope'
Aster lateriflorus 'Lady in Black'
Aster lateriflorus var. horizontalis AGM
Aster linosyris
Aster 'Little Carlow' (cordifolius hybrid) AGM
Aster maackii
Aster novae-angliae 'Andenken an Alma Pötschke'
Aster novae-angliae 'Harrington's Pink' AGM
Aster novae-angliae 'Lachsglut'
Aster novae-angliae 'Purple Dome'
Aster novae-angliae 'Treasure'
Aster novae-angliae 'Wow'
Aster novi-belgii 'Ada Ballard'
Aster novi-belgii 'Marie Ballard'
Aster oblongifolius 'Fanny's'
Aster 'Ochtendgloren' (pringlei hybrid) AGM
Aster 'Oktoberlicht'
Aster 'Photograph' AGM
Aster pilosus var. pringlei 'Monte Cassino' AGM
Aster turbinellus hybrid
Aster umbellatus
Aster x frikartii
Aster x frikartii 'Mönch' AGM
Astilbe 'Burgunderrot' (× arendsii)
Astilbe 'Ellie' (× arendsii)
Astilbe 'Etna' (japonica hybrid)
Astilbe 'Federsee' (× arendsii)
Astilbe 'Flamingo' (PBR) (× arendsii)
Astilbe 'Irrlicht' (× arendsii)
Astilbe 'Montgomery' (japonica hybrid)
Astilbe 'Pink Lightening' (PBR) (simplicifolia hybrid)
Astilbe 'Weisse Gloria' (× arendsii)
Astrantia 'Buckland'
Astrantia 'Hadspen Blood'
Astrantia major
Astrantia major 'Abbey Road' (PBR)
Astrantia major 'Claret'
Astrantia major 'Gill Richardson'
Astrantia major 'Ruby Wedding'
Astrantia major subsp. involucrata 'Moira Reid'
Astrantia major var. rosea
Astrantia major var. rosea George's form
Astrantia 'Roma' (PBR)
Astrantia 'Star of Beauty' (PBR)
Asyneuma prenanthoides
Athyrium niponicum var. pictum 'Burgundy Lace' (PBR)
Athyrium niponicum var. pictum 'Ursula's Red'
Athyrium vidalii
Atriplex hortensis var. rubra
Aubrieta 'Rose Queen'
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