OENANTHE javanica ‘Flamingo’
OENOTHERA kunthiana
OENOTHERA odorata
OENOTHERA stricta
OENOTHERA stricta ‘Sulphurea’
OENOTHERA fruticosa ‘Fyrverkeri’
OENOTHERA acaulis
OMPHALODES verna
OMPHALODES cappadocica ‘Starry Eyes’
ONOSMA alborosea
ONOSMA echioides
ONYCHIUM japonicum
OPHIOPOGON japonicus ‘Compactus’
OPHIOPOGON planiscapus
OPHIOPOGON planiscapus ‘Nigrescens’
OPHIOPOGON japonicus ‘Minor’
OPHIOPOGON chingii
OPUNTIA cantabrigiensis
ORIGANUM laevigatum ‘Hopleys’
ORIGANUM ‘Rosenkuppel’
ORIGANUM ‘Kent Beauty’
ORIGANUM vulgare ‘Compactum’
ORIGANUM vulgare ‘Thumble’s Variety’
ORIGANUM laevigatum ‘Herrenhausen’
OSMANTHUS ex. Korea
OSMANTHUS heterophyllus ‘Purpureus’
OSMANTHUS delavayi
OSMANTHUS heterophyllus ‘Gulftide’
OSMANTHUS heterophyllus ‘Variegatus’
OSMUNDA claytoniana
OSMUNDA regalis ‘Purpurascens’
OSMUNDA species ex. Russia
OSMUNDA regalis ‘Cristata’
OSTEOSPERMUM ‘Giant’
OSTEOSPERMUM ‘Weetwood’
OSTEOSPERMUM jucundum
OSTEOSPERMUM ‘Chris Brickell’
OURISIA ‘Loch Ewe’
OXALIS magellanica ‘Nelson’
OXALIS semiloba
OZOTHAMNUS rosmarinifolius ‘Silver Jubilee’
