Orris
Iris pallida
From southern Europe, this 4-ft.-tall rhizomatous iris has branching stems and blue flowers with a yel...
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Osage Orange
Maclura pomifera
Native from Arkansas to Oklahoma and Texas. Fast growth to 60 ft. tall and 40 ft. wide (though often l...
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Oso Berry
Oemleria cerasiformis
In damp woodlands and meadows in the Northwest and in parts of California, oso berry’s tiny, almond-sc...
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Ostrich Fern
Matteuccia struthiopteris
Native to northern regions of North America, Europe, Asia. Is hardy to extreme cold and does not grow ...
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Ox-Eye Daisy
Chrysanthemum leucanthemum
European native naturalized in many places; spreads by rhizomes and self-seeding. To 2 ft. high, 1 ft....
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Ox-eye Sunflower
Heliopsis helianthoides
Native to the eastern half of North America, extending southwest to Arizona. The species is rarely off...
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Oyama Magnolia
Magnolia sieboldii
Maturing at just 6 to 15 ft. high and wide, this is a good magnolia for small gardens. Buds look like ...
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Ozark Sundrops
Oenothera macrocarpa
Native to south-central U.S. Grows 6 in. tall and 2 ft. wide, with narrow, lance-shaped leaves to 3 in...
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