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Oak-leaf hydrangea

Hydrangea quercifolia

Plant in moist, slightly acidic, humus-rich, well-drained soil in partial to full shade; oakleaf hydrangea is the premier four-season native flowering shrub for shade, offering showy white cone-shaped flower panicles in early summer that fade gracefully to dusty pink and tan and persist on the plant

Oakleaf goosefoot

Oxybasis glauca

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Oat grass

Acroceras zizanioides

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Obedience

Physostegia virginiana

Sow seeds 1/8 in deep; cold stratification for 4–6 weeks improves germination. Plant in moist to average soil in full sun; established plants spread aggressively by underground rhizomes and may require annual division to prevent them from overtaking the border. The name refers to the curious behavio

Oblong-leaf sundew

Drosera intermedia

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Oblongleaf orache

Atriplex oblongifolia

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Obscure morning-glory

Ipomoea obscura

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Obtuse sedge

Carex obtusata

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Oca (New Zealand Yam)

Oxalis tuberosa

Plant small tubers 3 inches deep in loose, well-drained soil in early spring; oca is an Andean crop from the clover family and grows best in cool, moist conditions similar to potato, but requires a very long growing season. The plants produce clover-like foliage and only initiate tuber formation in

Oceana serrulata

Oceana serrulata

Ocimum carnosum

Ocimum carnosum

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Oconee Azalea

Rhododendron flammeum

Oconee Azalea is a spectacular native deciduous azalea of dry to mesic upland oak-hickory and pine-oak woods of Georgia and South Carolina, producing some of the most vivid orange, red, and scarlet floral displays of any native North American shrub when it blooms in March and April — before or with

Oconee Bells

Shortia galacifolia

Oconee Bells is one of the rarest and most celebrated native wildflowers in North America — an Appalachian endemic once thought extinct, restricted to a handful of gorge sites along the headwaters of the Savannah River in western South Carolina, southwestern North Carolina, and extreme northeastern

Ocotea aciphylla

Ocotea aciphylla

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Ocotea lancifolia

Ocotea lancifolia

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Ocotea longifolia

Ocotea longifolia

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Ocotea puberula

Ocotea puberula

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Octoblepharum albidum

Octoblepharum albidum

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Octopus Agave (Soft-Leaf Agave)

Agave vilmoriniana

Plant bulbils or offsets in well-drained, dry to moderately moist soil in full sun to partial shade — octopus agave is named for its remarkably distinctive rosette of long, twisting, channeled leaves that curl and undulate in organic, sinuous curves resembling the arms of an octopus — a shape unlike

Odontarrhena alpestris

Odontarrhena alpestris

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Odontites jaubertianus

Odontites jaubertianus

Odontites litoralis

Odontites litoralis

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Odontites vernus

Odontites vernus

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Odontites viscosus

Odontites viscosus

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