List of garden plants in North America
A
- Abelia
- Abeliophyllum (white forsythia)
- Abelmoschus (okra)
- Abies (fir)
- Abroma
- Abromeitiella (obsolete)
- Abronia (sand verbena)
- Abrus
- Abutilon
- Acacia (wattle)
- Acaena
- Acalypha
- Acanthaceae
- Acanthodium
- Acantholimon
- Acanthopale
- Acanthophoenix
- Acanthus
- Acca
- Acer (maple)
- Achariaceae
- Achillea (yarrow)
- Achimenantha (hybrid genus)
- Achimenes
- Acinos (calamint)
- Aciphylla
- Acmena
- Acoelorraphe (saw palm)
- Acokanthera
- Aconitum (aconite, monkshood)
- Acorus
- Acradenia
- Acrocomia
- Actaea (baneberry)
- Actinidia (kiwifruit)
- Ada orchid genus
- Adansonia
- Adenandra
- Adenanthos
- Adenia
- Adenium
- Adenocarpus
- Adenophora
- Adenostoma
- Adiantum (maidenhair fern)
- Adlumia
- Adonis
- Adromischus
- Aechmea
- Aegopodium
- Aeonium
- Aerangis (an orchid genus)
- Aerides (an orchid genus)
- Aeschynanthus
- Aesculus
- Aethionema
- Afgekia
- Agapanthus
- Agapetes
- Agastache
- Agathis
- Agathosma
- Agave
- Ageratum
- Aglaia
- Aglaomorpha
- Aglaonema
- Agonis
- Agrimonia
- Agrostemma (corn cockle)
- Agrostis
- Aichryson
- Ailanthus (tree of heaven, etc.)
- Aiphanes
- Aira (hair grass)
- Ajania
- Ajuga (bugleweed)
- Akebia
- Alangium
- Alberta
- Albizia (silk tree)
- Albuca
- Alcea (hollyhock)
- Alchemilla
- Aldrovanda
- Aleurites
- × Aliceara (hybrid genus)
- Alisma (water plantain)
- Alkanna
- Allagoptera
- Allamanda
- Allium (onion)
- Allocasuarina
- Allosyncarpia
- Alloxylon
- Alluaudia
- Alnus (alder)
- Alocasia
- Aloe
- Aloinopsis
- Alonsoa
- Alopecurus (foxtail grass)
- Aloysia
- Alphitonia
- Alpinia (ginger lily)
- Alsobia
- Alstonia
- Alstroemeria
- Alternanthera
- Althaea
- Alyogyne
- Alyssum
- Alyxia
- Amaranthus
- Amarcrinum (hybrid genus)
- Amarygia (hybrid genus)
- Amaryllis
- Amberboa
- Amelanchier
- Amesiella
- Amherstia
- Amicia
- Ammi
- Ammobium
- Amorpha
- Amorphophallus
- Ampelopsis
- Amsonia
- Anacampseros
- Anacardium
- Anacyclus
- Anagallis (pimpernel)
- Ananas (pineapple)
- Anaphalis
- Anchusa
- Andersonia
- Andira
- Androlepis
- Andromeda
- Andropogon
- Androsace
- Anemone (windflower)
- Anemonella
- Anemonopsis
- Anemopaegma
- Anethum (dill)
- Angelica
- Angelonia
- Angiopteris
- Angophora
- Angraecum (an orchid genus)
- Anguloa (an orchid genus)
- Angulocaste (a hybrid orchid genus)
- Anigozanthos
- Anisacanthus
- Anisodontea
- Annona
- Anoda
- Anomatheca (See Freesia)
- Anopterus
- Anredera
- Antennaria
- Anthemis
- Anthericum
- Anthocleista
- Anthotroche
- Anthriscus
- Anthurium
- Anthyllis
- Antidesma
- Antigonon
- Antirrhinum (snapdragon)
- Apera
- Aphelandra
- Aphyllanthes
- Apium
- Apocynum
- Aponogeton
- Apophyllum
- Apodytes
- Aponogeton
- Aporocactus
- Aporoheliocereus (hybrid genus)
- Aprevalia
- Aptenia, synonym of Mesembryanthemum
- Aquilegia (columbine)
- Arabis (rock cress)
- Arachis
- Arachniodes
- Arachnis (scorpion orchid) (orchid genus)
- Araeococcus
- Araiostegia
- Aralia
- Araucaria (monkey-puzzle)
- Araujia
- Arbutus (madrone)
- Archidendron
- Archontophoenix (king palm)
- Arctium
- Arctostaphylos (bearberry, manzanita)
- Arctotheca
- Arctotis (African daisy)
- Ardisia
- Areca
- Arenaria (sandwort)
- Arenga
- Argemone (prickly poppy)
- Argyranthemum
- Argyreia
- Argyroderma
- Ariocarpus
- Arisaema
- Arisarum
- Aristea
- Aristolochia
- Aristotelia
- Armeria
- Armoracia
- Arnebia
- Arnica
- Aronia (chokeberry)
- Arrabidaea, see Bignonia magnifica
- Arrhenatherum (oat grass)
- Artanema
- Artabotrys
- Artemisia (mugwort, sagebrush, wormwood)
- Arthrocereus
- Arthropodium
- Artocarpus
- Arum
- Aruncus
- Arundina
- Arundinaria
- Arundo
- Asarina
- Asarum (wild ginger)
- Asclepias (milkweed, silkweed)
- × Ascocenda (hybrid genus) (an orchid genus)
- Ascocentrum an orchid genus
- Asimina
- Asparagus
- Asperula (woodruff)
- Asphodeline
- Asphodelus (asphodel)
- Aspidistra
- Asplenium
- Astelia
- Aster
- Asteranthera
- Astilbe
- Astilboides
- Astragalus (milk vetch)
- Astrantia
- Astrophytum
- Asystasia
- Atalaya
- Athamanta
- Atherosperma
- Athrotaxis
- Athyrium
- Atriplex
- Attalea
- Aubrieta
- Aucuba
- Aulax
- Auranticarpa
- Aurinia
- Austrocedrus
- Austrocylindropuntia
- Austrostipa
- Averrhoa
- Avicennia
- Azadirachta
- Azalea
- Azara
- Azolla (aquatic ferns)
- Azorella
- Azorina
- Aztekium
- Azetura