Oak: arexene Oak: arkansana
Oak: brantii Oak: candicans
Oak: carolinianus Oak: castaneifolia
Oak: chrysolepis, Live Oak: emoryi, Live
Oak: falcata, Spanish Oak: hemisphaerica, Laurel
Oak: infectoria Oak: infectoria veneris
Oak: ithaburensis, Vallonea Oak: macrocarpa, Burr
Oak: macrocarpa, Mossy Cup Oak: macroroburhybrid
Oak: marilandica, Blackjack Oak: quadrangulata
Oak: rugosa, Netleaf Oak: salicina
Oak: schuetteihybrid Oak: texana, Spanish
Oak: turnerihybrid Oak: velutina, Black
Oakleaf Hydrangea (spp.) Oakleaf Hydrangea 'Alice'
Oakleaf Hydrangea 'Allison' Oakleaf Hydrangea 'Brenhill (Gatsby Gal™)'
Oakleaf Hydrangea 'Gatsby Moon™' Oakleaf Hydrangea 'Gatsby Star™'
Oakleaf Hydrangea 'Harmony' Oakleaf Hydrangea 'Semmes Beauty'
Oakleaf Hydrangea 'Snow Queen' Oakleaf Hydrangea 'Snowflake'
Oakleaf Hydrangea 'Syke's Dwarf' Oakleaf Mountain Ash
'Obovata' Copperleaf Ocean Spray
Ochrosia Oconee Azalea
Ocotillo Ocotillo Macho
Ocotillo, Tree Ocotillo: macdougalii
Ocotillo: purpusii Ocotillo: splendens
Octopus Plant: actinophylla (spp.) Octopus Plant: actinophylla 'Amate™'
Octopus Tree (spp.) Octopus Tree 'Amate™'
Ogeechee Lime Ogeechee Tupelo
'Ogi nagare' Japanese Maple Ohio Buckeye (spp.)
Ohio Buckeye 'Monticola' Ohio Buckeye 'Sargentii'
Ohio Buckeye: glabra pallida 'Ohlendorfii' Norway Spruce
Oil Tree, Poonga 'Oiseau Bleu' Rose of Sharon
'Ojochin' Oriental Cherry 'Okame' Heavenly Bamboo
'Okima' Japanese Maple 'Oklahoma' Oklahoma Redbud
Oklahoma Redbud 'Oklahoma' Oklahoma Redbud 'Texas White'
'Oklahoma' Rose 'Okukuji nishiki' Japanese Maple
'Okushimo' Japanese Maple Old Fashioned Weigela (spp.)
Old Fashioned Weigela 'Abel Carriere' Old Fashioned Weigela 'Boskoop Glory'
Old Fashioned Weigela 'Bristol Ruby' Old Fashioned Weigela 'Candida'
Old Fashioned Weigela 'Carnaval™' Old Fashioned Weigela 'Darts Color Dream'
Old Fashioned Weigela 'Eva Rathke' Old Fashioned Weigela 'Eva Supreme'
Old Fashioned Weigela 'Evita' Old Fashioned Weigela 'Eyecatcher'
Old Fashioned Weigela 'Fine Wine®' Old Fashioned Weigela 'Foliis Purpureis'
Old Fashioned Weigela 'Ghost™' Old Fashioned Weigela 'Java Red'
Old Fashioned Weigela 'Lucifer™' Old Fashioned Weigela 'Midnight Wine®'
Old Fashioned Weigela 'Minuet' Old Fashioned Weigela 'My Monet™'
Old Fashioned Weigela 'Nain Rouge' Old Fashioned Weigela 'Newport Red'
Old Fashioned Weigela 'Olympiad' Old Fashioned Weigela 'Pink Delight'
Old Fashioned Weigela 'Pink Princess' Old Fashioned Weigela 'Polka'
Old Fashioned Weigela 'Red Prince' Old Fashioned Weigela 'Rosea'
Old Fashioned Weigela 'Rubidor' Old Fashioned Weigela 'Ruby Kins'
Old Fashioned Weigela 'Rumba' Old Fashioned Weigela 'Samba'
Old Fashioned Weigela 'Sonic Bloom® Pearl' Old Fashioned Weigela 'Sonic Bloom® Pink'
Old Fashioned Weigela 'Sonic Bloom™ Red' Old Fashioned Weigela 'Spilled Wine®'
Old Fashioned Weigela 'Sunny Princess' Old Fashioned Weigela 'Susanne'
Old Fashioned Weigela 'Tango' Old Fashioned Weigela 'Teline'
Old Fashioned Weigela Variegated Old Fashioned Weigela Variegated Dwarf
Old Fashioned Weigela 'Versicolor' Old Fashioned Weigela 'Victoria'
Old Fashioned Weigela 'White Knight' Old Field Juniper
'Old Gold' American Holly 'Old Gold' Chinese Juniper
Old Man Banksia Old Man Palm
Old Man's Beard Old Man's Beard: virginicus
'Old Red Moss' Rose