Every plant in the world

Species catalog

Care data, real photos from members’ collections and a community bloom calendar – for every species.

1305species in catalog
378genera
98species grown by members
★ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Genera: O

30 species

Obregonia

CactaceaeIt grows slowly and rots easily – water only once the soil is bone dry.
Cactus · CactaceaeArtichoke cactusObregonia denegriiBe the first to grow it!

Ocimum

LamiaceaePinch out flower buds to keep the leaves aromatic; it hates cold drafts.
Herb · LamiaceaeBasilOcimum basilicumBe the first to grow it!Herb · LamiaceaeHoly basilOcimum tenuiflorumBe the first to grow it!

Olea

OleaceaeNeeds a cool (5–10 °C), bright winter to flower and fruit.
Tree / bonsai · OleaceaeOlive treeOlea europaeaBe the first to grow it!

Oncidium

OrchidaceaeWrinkled pseudobulbs signal thirst or root trouble.
Orchid · OrchidaceaeOncidium altissimumno common nameBe the first to grow it!Orchid · OrchidaceaeOncidium cheirophorumno common nameBe the first to grow it!Orchid · OrchidaceaeOncidium leucochilumno common nameBe the first to grow it!Orchid · OrchidaceaeOncidium ornithorhynchumno common nameBe the first to grow it!Orchid · OrchidaceaeOncidium sphacelatumno common nameBe the first to grow it!

Opuntia

CactaceaeIts tiny glochids lodge in skin – handle it with tongs or folded newspaper.
Cactus · CactaceaeBeavertail cactusOpuntia basilarisBe the first to grow it!Opuntia cylindrica cristataCactus · CactaceaeOpuntia cylindrica cristatano common name1 growers1 plantsCactus · CactaceaeEngelmann's prickly pearOpuntia engelmanniiBe the first to grow it!Opuntia erinaceaCactus · CactaceaeOpuntia erinaceano common name1 growers1 plantsCactus · CactaceaeIndian figOpuntia ficus-indicaBe the first to grow it!Cactus · CactaceaeBrittle prickly pearOpuntia fragilisBe the first to grow it!Opuntia humifusaCactus · CactaceaeEastern prickly pearOpuntia humifusa1 growers1 plantsCactus · CactaceaeBunny ears cactusOpuntia microdasysBe the first to grow it!Opuntia microdasys albispinaCactus · CactaceaeOpuntia microdasys albispinano common name1 growers1 plantsOpuntia microdasys pallidaCactus · CactaceaeOpuntia microdasys pallidano common name1 growers1 plantsCactus · CactaceaeDrooping prickly pearOpuntia monacanthaBe the first to grow it!Opuntia tuna monstrosaCactus · CactaceaeOpuntia tuna monstrosano common name1 growers1 plants

Oreocereus

CactaceaeAn Andean species: loves cool, airy, very bright spots and hates stuffy heat.
Cactus · CactaceaeOld man of the AndesOreocereus celsianusBe the first to grow it!Cactus · CactaceaeOreocereus leucotrichusno common nameBe the first to grow it!Oreocereus trolliiCactus · CactaceaeOreocereus trolliino common name1 growers1 plants

Origanum

LamiaceaeHarvest for drying as flowering begins – the aroma is strongest then.
Herb · LamiaceaeDittany of CreteOriganum dictamnusBe the first to grow it!Herb · LamiaceaeSweet marjoramOriganum majoranaBe the first to grow it!Herb · LamiaceaePot marjoramOriganum onitesBe the first to grow it!Herb · LamiaceaeOreganoOriganum vulgareBe the first to grow it!

Oroya

Cactaceae
Oroya laxiareolataCactus · CactaceaeOroya laxiareolatano common name1 growers1 plants

Oxalis

OxalidaceaeIf it drops its leaves, let it rest dry for 3–4 weeks and it will resprout from the bulbs.
Houseplant · OxalidaceaeFalse shamrockOxalis triangularisBe the first to grow it!
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