Abelia chinensis

Abelia ×grandiflora 'Abelops'

Abelia ×grandiflora 'Canyon Creek'

Abelia ×grandiflora 'Conti'

Abelia ×grandiflora 'Francis Mason'

Abelia ×grandiflora 'Goldenglossy'

Abelia ×grandiflora 'Hopleys'

Abelia ×grandiflora 'Kaleidoscope'

Abelia ×grandiflora 'Keiser'

Abelia ×grandiflora 'Mardi Gras'

Abelia ×grandiflora 'Margarita'

Abelia ×grandiflora 'Minduo1'

Abelia ×grandiflora 'Radiance'

Abelia ×grandiflora 'Wev02'

Abelia integrifolia

Abelia 'Lynn'

Abelia parvifolia 'Saxon Gold'

Abelia spathulata

Abelia 'X10-9002-23'

Abelia 'X10-9010-12'

Abelia 'X10-9028-7'

Abelia 'X10-9044-1'

Abelmoschus manihot

Abies firma

Abutilon megapotamicum 'Little Imp'

Acalypha pendula

Acanthus balcanicus

Acanthus dioscoridis var. perringii

Acanthus 'Morning Candle'

Acanthus spinosus

Acanthus 'Summer Beauty'

Acca sellowiana 'NCSU Hardy'

Acer buergerianum var. formosanum

Acer buergerianum 'Miyasama'

Acer caudatifolium

Acer cissifolium

Acer davidii × A. tegmentosum

Acer fabri

Acer japonicum 'Aconitifolium'

Acer japonicum 'Vitifolium'

Acer miyabei

Acer negundo 'Flamingo'

Acer negundo 'Kelly's Gold'

Acer palmatum

Acer palmatum 'Ao kanzashi'

Acer palmatum 'Asahi Zuru'

Acer palmatum 'Beni komachi'

Acer palmatum 'Beni schichihenge'

Acer palmatum 'Corallinum'

Acer palmatum Dissectum Atropurpureum Group

Acer palmatum Dissectum Viride Group

Acer palmatum 'E.P.'

Acer palmatum 'Higasa yama'

Acer palmatum 'Hubb's Red Willow'

Acer palmatum 'Linearilobum'

Acer palmatum 'Margaret Bee'

Acer palmatum 'Mikawa Yatsubusa'

Acer palmatum 'Nishiki gawa'

Acer palmatum 'Nishiki Momiji'

Acer palmatum 'Oregon Sunset'

Acer palmatum 'Ōsakasuki'

Acer palmatum 'Pendulum Julian'

Acer palmatum 'Red Baron'

Acer palmatum 'Ryusen'

Acer palmatum 'Scolopendriifolium'

Acer palmatum 'Seiun kaku'

Acer palmatum 'Sekka Yatsubusa'

Acer palmatum 'Shishigashira'

Acer palmatum 'Sumi Nagashi'

Acer palmatum 'Summer Gold'

Acer palmatum 'Ukigumo'

Acer palmatum 'Waterfall'

Acer palmatum 'Wou Nishiki'

Acer pictum var. mono

Acer pilosum var. stenolobum

Acer pseudosieboldianum × A. palmatum

Acer pubinerve

Acer shirasawanum 'Jordan'

Acer skutchii 'Tequila Sunrise'

Acer stachyophyllum subsp. betulifolium

Acer tataricum subsp. semenovii

Acer tataricum subsp. tataricum

Acer triflorum

Acer tschonoskii

Achillea

Achillea millefolium (Montrose rose form)

Achillea millefolium 'Paprika'

Achillea 'Sassy Summer Lemon'

Acis autumnalis

Acorus gramineus 'Masamune'

Adina rubella 'Purple Flower'

Aesculus ×arnoldiana

Aesculus californica 'Canyon Pink'

Aesculus ×carnea 'Fort McNair'

Aesculus ×carnea 'Rosea'

Aesculus ×carnea 'Variegata'

Aesculus ×carnea (variegated)

Aesculus glabra var. arguta

Aesculus 'Homestead'

Aesculus indica 'Sydney Pearce'

Aesculus ×mutabilis 'Induta'

Aesculus parviflora

Aesculus parviflora 'Rogers'

Aesculus pavia 'Fishtail'

Aesculus pavia 'Humilis'

Aesculus pavia var. pavia

Aesculus pavia 'Splendens'

Aesculus ×woerlitzensis

Aethionema saxatile

Aethionema schistosum

Aethionema subulatum

Agapanthus

Agapanthus 'Early Blue'

Agapanthus inapertus major

Agapanthus 'Monmid'

Agapanthus 'White Heaven'

Agastache 'Blue Boa'

Agastache scrophulariifolia 'Blue Licorice'

Agave asperrima

Agave havardiana

Agave lechuguilla

Agave lophantha

Agave lophantha × A. salmiana var. ferox 'Logan Calhoun'

Agave ovatifolia

Agave parryi 'J.C. Raulston'

Agave parryi subsp. parryi var. huachucensis

Agave parviflora

Agave salmiana

Agave striata

Agave striata var. striata

Agave tenuifolia

Ageratina ligustrina

Ajania × Chrysanthemum

Ajania pacifica

Ajuga incisa 'Bikun'

Ajuga pyramidalis 'Metallica Crispa'

Ajuga reptans

Ajuga reptans 'Binblasca'

Ajuga reptans 'Dixie Chip'

Akebia longeracemosa

Akebia quinata 'Kohin Nishiki'

Akebia quinata (silver overlay)

Akebia trifoliata (variegated)

Alangium platanifolium

Albizia coreana

Albizia julibrissin 'Ishii Weeping'

Albuca shawii

Alcea froloviana

Allium

Allium akaka

Allium ampeloprasum var. ampeloprasum

Allium atropurpureum

Allium caeruleum

Allium canadense var. florosum 'White Flag'

Allium canadense var. mobilense

Allium carinatum subsp. pulchellum f. album

Allium cepa 'Medusa'

Allium christophii

Allium cyrilli

Allium flavum

Allium jesdianum 'Early Emperor'

Allium karataviense

Allium 'Millennium'

Allium neapolitanum

Allium 'Pink Feathers'

Allium 'Pink Planet'

Allium senescens 'Glauca'

Allium sphaerocephalon

Allium stellatum

Allium 'Sugar Melt'

Allium 'Summer Drummer'

Allium triquetrum

Allium tuberosum

Allium virgunculae var. kiiense

Alocasia 'Portodora'

Aloinopsis spathulata

Alstroemeria 'Casablanca'

Alstroemeria 'Freedom'

Alstroemeria ×hybrida 'Pas2052'

Alstroemeria 'Sweet Laura'

Althaea broussonetiifolia

×Amarcrinum

×Amarcrinum memoria-corsii

×Amarcrinum memoria-corsii 'Howardii'

Amaryllis belladonna

Amelanchier canadensis 'Glenn Form'

Amelanchier ×grandiflora 'Silver Fountain'

Amorpha nitens

Amorphophallus kiusianus

Amorphophallus konjac

Ampelaster carolinianus

Amsonia 'Blue Ice'

Amsonia ciliata var. filifolia 'Georgia Pancake'

Amsonia ciliata 'Halfway to Arkansas'

Amsonia elliptica

Amsonia hubrichtii

Amsonia tabernaemontana 'Storm Cloud'

Amsonia tabernaemontana var. tabernaemontana

Anacampseros rufescens

Andropogon gerardii 'Lord Snowden's Big Blue'

Anemone blanda 'Blue Shades'

Anemone blanda 'Violet Star'

Anemone blanda 'White Splendor'

Anisacanthus quadrifidus var. wrightii

Anisacanthus quadrifidus var. wrightii 'Pumpkin'

Antirrhinum braun-blanquetii