Achillea 'Anthea' Achillea 'Coronation Gold'
Achillea 'Pink Grapefruit' Achillea 'Pomegranate'
Achillea 'Red Velvet' Achillea 'Schwellenberg'
Achillea 'Sunny Seduction' Achillea aegyptiaca
Achillea ageratum Achillea clavennae
Achillea filipendulina Achillea filipendulina 'Credo'
Achillea filipendulina 'Parker's Variety' Achillea x lewisii 'King Edward'
Achillea millefolium Achillea millefolium 'Apple Blossom'
Achillea millefolium 'Cerise Queen' Achillea millefolium 'Colorado'
Achillea millefolium 'Fanal' Achillea millefolium 'Fire King'
Achillea millefolium 'Fireland' Achillea millefolium 'Heidi'
Achillea millefolium 'Hoffnung' Achillea millefolium 'Moonshine'
Achillea millefolium 'Ortel's Rose' Achillea millefolium 'Paprika'
Achillea millefolium 'Pink Deb' Achillea millefolium 'Red Beauty'
Achillea millefolium 'Snowsport' Achillea millefolium 'Summer Pastels'
Achillea millefolium 'Summerwine' Achillea millefolium 'Terra Cotta'
Achillea millefolium 'Weser River Sandstone' Achillea millefolium 'White Beauty'
Achillea ptarmica 'Nana Compacta' Achillea ptarmica 'The Pearl'
Achillea tomentosa Achillea tomentosa 'Maynard's Gold'
Achimenes longiflora Aciphylla glaucescens
Acmella oleracea Acmella oleracea 'Peek A Boo'
Acoelorraphe wrightii Aconitum 'Blue Sceptre'
Aconitum x cammarum Aconitum x cammarum 'Eleanor'
Aconitum x cammarum 'Stainless Steel' Aconitum carmichaelii
Aconitum napellus Aconitum napellus 'Album'
Aconitum napellus 'Bi-color' Aconitum uncinatum
Acorus calamus 'Variegatus' Acorus gramineus
Acorus gramineus 'Aureopusillus Minimus' Acorus gramineus 'Masamune'
Acorus gramineus 'Ogon' Acorus gramineus 'Variegatus'
Acrocomia crispa Acrocomia spp.
Acrostichum danaeifolium Actaea racemosa
Actaea racemosa 'Brunette' Actaea rubra
Actaea simplex 'Black Negligee' Actaea simplex 'Hillside Black Beauty'
Actaea simplex 'White Pearl' Actinidia deliciosa
Actinidia kolomikta Actinidia kolomikta 'Arctic Beauty'
Actinodium cumminghamii Adansonia digitata
Adenanthos cunninghamii Adenanthos sericeus
Adenium obesum Adenium obesum 'Crimson Star'
Adenophora confusa Adenophora liliifolia
Adenophora stricta Adenostoma fasciculatum
Adenostoma fasciculatum 'Black Diamond' Adenostoma sparsifolium
Adiantum capillus-veneris Adiantum macrophyllum
Adiantum pedatum Adiantum raddianum
Adiantum trapeziforme var. braziliense Adiantum venustum
Adonis annua Adonis vernalis
Adromischus triflorus