| | | | |
| A | Genus | Species | Cultivar | Common Name |
 | ABELIA | x grandiflora | | |
| ACAENA | ovalifolia | | |
| ACANTHUS | hungaricus | | Syn. A.longifolius |
| ACANTHUS | mollis | Latifolius Group | Bear's Breeches |
| ACHILLEA | | 'Anthea' | |
| ACHILLEA | | 'Credo' | AGM |
| ACHILLEA | | 'Fanal' | |
| ACHILLEA | | 'Lachsschonheit' | Syn. A.'Salmon Beauty' |
| ACHILLEA | | 'Martina' | AGM |
| ACHILLEA | | 'Moonshine' | AGM |
| ACHILLEA | | 'Rose Madder' | |
| ACHILLEA | | 'Summerwine' | AGM |
| ACHILLEA | | 'Terracotta' | |
| ACHILLEA | | 'Walther Funcke' | |
| ACHILLEA | millefolium | 'Cerise Queen' | |
| ACHILLEA | millefolium | 'Cherry King' | |
| ACONITUM | | 'Bressingham Spire' | AGM Monkshood |
| ACONITUM | | 'Ivorine' | |
| ACONITUM | | 'Spark's Variety' | syn A.henryi 'S.v' |
| ACONITUM | | 'Stainless Steel' | |
| ACONITUM | carmichaelii | 'Arendsii' | AGM |
| ACONITUM | carmichaelii | Wilsonii Group | |
| ACONITUM | carmichaelii | Wilsonii Group 'Kelmscott' | AGM |
| ACONITUM | carmichaelii | Wilsonii Group 'Spatlese' | |
| ACONITUM | lycoctomum | 'Dark Eyes' | |
| ACONITUM | napellus | | |
| ACONITUM | napellus | 'Rubellum' | |
| ACONITUM | napellus ssp.compactum | 'Carneum' | |
| ACONITUM | napellus subsp.napellus | Anglicum Group | syn. A.anglicum |
| ACONITUM | napellus subsp.vulgare | 'Albidum' | syn A.n.'Albus' |
| ACONITUM | x cammarum | 'Bicolour' | AGM |
| ACORUS | gramineus | 'Variegatus' | Variegated Japanese Rush |
| ACTAEA | pachypoda | | AGM syn A.alba |
| ADIANTUM | venustum | | AGM Maidenhair Fern |
| ADONIS | aestivalis | | Pheasant's Eye |
| AEONIUM | | 'Zwartkop' | AGM |
| AGAPANTHUS | | 'Dokter Brouwer' | |
| AGAPANTHUS | | Headbourne Hybrids | |
| AGAPANTHUS | | 'Purple Cloud' | |
| AGAPANTHUS | | 'Windsor Grey' | |
| AGAPANTHUS | africanus | 'Venezuela' | |
| AGAPANTHUS | campanulatus | var. albidus | |
| AGASTACHE | | 'Blue Fortune' | AGM |
| AGASTACHE | rugosa | | Anise Hyssop. syn A.rugosa |
| AGASTACHE | rugosa | 'Liquorice Blue' | Syn. A.urticifolia |
| AGAVE | americanum | | |
| AGAVE | americanum | blue | |
| AGAVE | americanum | 'Striata' | |
| AGAVE | americanum | 'Variegata' | AGM |
| AJUGA | reptans | | Bugle |
| AJUGA | reptans | 'Multicolor' | Syn. A.reptans 'Rainbow' |
| ALCEA | rugosa | | |
| ALCEA X ALTHAEA | | 'Parkallee' | |
| ALCHEMILLA | alpina | | |
| ALCHEMILLA | erythropoda | | |
| ALCHEMILLA | mollis | | AGM Lady's Mantle |
| ALLIUM | | 'Schubertii' | |
| ALLIUM | azureum | | |
| ALLIUM | caeruleum | | AGM |
| ALLIUM | cristophii | | AGM syn. A. albopilosum |
| ALLIUM | hollandicum | 'Purple Sensation' | AGM |
| ALLIUM | neapolitanum | | |
| ALLIUM | schoenoprasum | | Chives |
| ALLIUM | sphaerocephalon | | Drumstick Chives |
| ALOYSIA | triphylla | | AGM Lemon Verbena syn. Lippia citriodora |
| AMICIA | zygomeris | | |
| AMMI | majus | | |
| AMSONIA | tabernaemontana | | |
| ANAPHALIS | margaritacea | var. yedoensis | AGM |
| ANAPHALIS | nepalensis var.monocephala | | Syn. A. nubigena |
| ANAPHALIS | triplinervis | | AGM Pearl Everlasting |
| ANAPHALIS | triplinervis | 'Sommerschnee' | AGM |
| ANCHUSA | azurea | 'Loddon Royalist' | AGM |
| ANEMANTHELE | lessiana | | syn. Stipa arundinacea Pheasant's Tail Grass |
| ANEMONE | blanda | 'Atrocaerulea' | |
| ANEMONE | blanda | 'Pink Star' | |
| ANEMONE | blanda | 'White Splendour' | AGM |
| ANEMONE | coronaria | 'The Bride' | |
| ANEMONE | hupehensis | 'Hadspen Abundance' | AGM |
| ANEMONE | hupehensis | 'Splendens' | |
| ANEMONE | huphensis var.japonica | 'Pamina' | AGM |
| ANEMONE | huphensis var.japonica | 'Prinz Heinrich' | AGM |
| ANEMONE | multifida | 'Major' | |
| ANEMONE | nemorosa | 'Robinsoniana' | |
| ANEMONE | nemorosa | 'Vestal' | AGM |
| ANEMONE | x hybrida | 'Honorine Jobert' | AGM Japanese Anemone |
| ANEMONE | x hybrida | 'Konigin Charlotte' | AGM. Syn. A.'Queen Charlotte' |
| ANEMONE | x hybrida | 'Lady Gilmour' | |
| ANEMONE | x hybrida | 'Robustissima' | syn. A. vitifolia |
| ANEMONE | x hybrida | 'September Charm' | AGM syn.A.hupehensis 'S.C' |
| ANEMONE | x hybrida | 'Whirlwind' | |
| ANEMONE | x lipsiensis | | |
| ANGELICA | archangelica | | Angelica |
| ANGELICA | gigas | | |
| ANGELICA | pachycarpa | | syn. A.hispanica |
| ANGIOZANTHOS | manglesii | | Red and Green Kangaroo Paw |
| ANISODONTEA | capensis | | |
| ANOMATHECA | laxa | | AGM |
| ANOMATHECA | laxa var. alba | | AGM |
| ANTHEMIS | punctata subsp. | cupaniana | AGM |
| ANTHEMIS | tinctoria | 'E.C. Buxton' | Dyer's Chamomile |
| ANTHEMIS | tinctoria | 'Sauce Hollandaise' | |
| ANTHERICUM | liliago | | St. Bernard's Lily |
| ANTHRISCUS | sylvestris | 'Ravenswing' | |
| ANTIRRHINUM | molle | | |
| AQUILEGIA | | 'Apple Blossom' | |
| AQUILEGIA | State Series | 'Florida' | AGM |
| AQUILEGIA | vulgaris | | Granny's Bonnet |
| AQUILEGIA | vulgaris | var. alba | |
| AQUILEGIA | vulgaris | Vervaeneana Group | syn A.v.variegata |
| AQUILEGIA | vulgaris | 'William Guiness' | |
| AQUILEGIA | vulgaris | 'William Guiness Doubles' | |
| AQUILEGIA | vulgaris var. stellata | Barlow Series 'Nora Barlow' | AGM |
| AQUILEGIA | vulgaris var. stellata | 'Black Barlow' | |
| AQUILEGIA | vulgaris var.stellata | 'Ruby Port' | |
| ARGYRANTHEMUM | | 'Mrs F. Sander' | |
| ARGYRANTHEMUM | | 'Summer Cloud' | |
| ARGYRANTHEMUM | foeniculaceum | | |
| ARGYRANTHEMUM | gracile | 'Chelsea Girl' | AGM |
| ARISTEA | ecklonii | | |
| ARMERIA | maritima | 'Alba' | Ladies' Cushion |
| ARMERIA | maritma | | Sea Pink |
| ARMERIA | maritma | 'Splendens' | Sea Pink |
| ARMERIA | pseudarmeria | | |
| ARTEMISIA | | 'Powis Castle' | AGM |
| ARTEMISIA | alba | 'Canescens' | AGM syn.A.splendens |
| ARTEMISIA | dracunculus | | French Tarragon |
| ARTEMISIA | lactiflora | Guizhou Group | |
| ARTEMISIA | ludoviciana | 'Silver Queen' | AGM |
| ARTEMISIA | schmidtiana | 'Nana' | AGM |
| ARUM | italicum subsp.italicum | 'Marmoratum' | yn.A.i.'Pictum' Lords and Ladies |
| ARUM | maculatum | | Arum Lily, Cuckoo Plant |
| ARUNCUS | dioicus | 'Kneiffii' | |
| ASPHODELINE | lutea | | King's Spear |
| ASPHODELUS | ramosus | | syn A.lusitanicus |
| ASPLENIUM | scolopendrium | | AGM Hart's Tongue Fern |
| ASTELIA | chathamica | | AGM |
| ASTER | | 'Coombe Fishacre' | AGM |
| ASTER | | 'Ringdove' (ericoides hybrid) | AGM |
| ASTER | amellus | 'King George' | AGM |
| ASTER | amellus | 'Rosa Erfullung' | syn. A. amellus 'Pink Zenith' |
| ASTER | amellus | 'September' | (name unknown) |
| ASTER | amellus | 'Veilchenkonigin' | AGM Syn.'A.amellus 'Violet Queen' |
| ASTER | cordifolius hybrid | 'Little Carlow' | AGM |
| ASTER | divaricatus | | syn. A.corymbosus |
| ASTER | ericoides | | |
| ASTER | laevis | 'Calliope' | |
| ASTER | lateriflorus | 'Lady in Black' | |
| ASTER | lateriflorus | var. horizontalis | AGM |
| ASTER | novae-angliae | 'Andenken an Alma Potschke' | |
| ASTER | novae-angliae | 'Barr's Pink' | |
| ASTER | novae-angliae | 'Harrington's Pink' | AGM |
| ASTER | novae-angliae | 'Herbstschee' | syn.A.n-a.'Autumn Snow' |
| ASTER | novae-angliae | 'Purple Dome' | |
| ASTER | novi-belgii | 'Mistress Quickly' | |
| ASTER | novi-belgii | 'Winston S. Churchill' | |
| ASTER | thomsonii | 'Nanus' | |
| ASTER | x frikartii | 'Monch' | |
| ASTER | x frikartii | 'Wunder von Stafa' | AGM |
| ASTILBE | | 'Bressingham Beauty' (x arendsii) | |
| ASTILBE | | 'Fanal' (x arendsii) | AGM |
| ASTILBE | | 'Irrlicht' (x arendsii) | |
| ASTILBE | | 'Montgomery' (japonica hybrid) | |
| ASTILBE | | 'Sprite' (simplicifolia hybrid) | AGM |
| ASTILBE | | 'Venus' (x arendsii) | |
| ASTILBE | chinensis var. pumila | | AGM |
| ASTILBE | chinensis var. taquetti | 'Purpurlanze' | |
| ASTILBE | chinensis var. taquetti | 'Superba' | AGM |
| ASTRANTIA | | 'Hadspen Blood' | |
| ASTRANTIA | | 'Snow Star' | |
| ASTRANTIA | | 'Sunningdale Variegated' | AGM |
| ASTRANTIA | major | | |
| ASTRANTIA | major | 'Claret' | |
| ASTRANTIA | major | 'Ruby Cloud' | |
| ASTRANTIA | major | 'Ruby Wedding' | |
| ASTRANTIA | major alba | | |
| ASTRANTIA | major subsp.involucrata | 'Moira Reid' | |
| ASTRANTIA | major subsp.involucrata | 'Shaggy' | AGM syn.A.m.I.'Margery Fish' |
| ASTRANTIA | major var.rosea | | |
| ASTRANTIA | maxima | | AGM |
| ASTRANTIA | maxima rosea | | |
| ATHYRIUM | filix-femina | | AGM Lady Fern |
| ATHYRIUM | niponicum | var.pictum | AGM Japanese Painted Fern syn. A.n.metallicum |
| ATRIPLEX | hortensis | var. rubra | Red Orache |