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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
OENOTHERA berlandieri 'Siskiyou'
(e-NOTH-er-a) (ber-lan-dee-ER-ee)
OENOSI3
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Common Name: Mexican Evening Primrose
Description: Fragrant, 2", pink blooms throughout the summer. Very hardy plant if given good drainage. Smaller and less invasive than Oenothera speciosa, although some taxonomists claim berlandiera = speciosa!
Zone: 5
Specifics: Full Sun Partial Shade

OENOTHERA fruticosa 'Sonnenwende'
(e-NOTH-er-a) (froo-ti-KO-sa)
OENOSO5
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Common Name: Evening Primrose, Sundrops
Description: Dark foliaged cultivar introduced by Marx in 1983. Abundant, bright yellow flowers.
Zone: 4
Specifics: Full Sun Partial Shade

OENOTHERA m. subsp. incana (SILVER BLADE®)
(e-NOTH-er-a) (mak-roe-KAR-pa)
OENOSB3
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Common Name: Evening Primrose, Sundrops
Description: 1999 Plant Select®. Southern Great Plains plant introduced by James Locklear, formerly of Nebraska Statewide Arboretum. Silvery-blue leaves complimented by huge, clear yellow flowers from May til frost. Drought tolerant perennial. Best on well-drained sites.
Zone: 4
Specifics: PlantSelect Rock Garden Wild Flower Full Sun Partial Shade Ground Cover

OENOTHERA macrocarpa [missouriensis]
(e-NOTH-er-a) (mak-roe-KAR-pa)
OENOMA3
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Common Name: Missouri Primrose
Description: RHS Award of Garden Merit. Large, deep yellow flowers; sprawling plant with glossy, dark green leaves.
Zone: 4
Specifics: Rock Garden Wild Flower Full Sun Partial Shade

OENOTHERA macrocarpa subsp. fremontii
(e-NOTH-er-a) (mak-roe-KAR-pa)
OENOFR3
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Common Name: Evening Primrose, Sundrops
Description: Large, light yellow flowers beginning in May; most have glaucous leaves, narrower than species. Drought tolerant plants, native to NE & KS.
Zone: 4
Specifics: Great Plants Rock Garden Wild Flower Full Sun Partial Shade

OENOTHERA pilosella 'Yella Fella'
(e-NOTH-er-a) (py-LOH-sell-ah)
OENOYF3
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Common Name: Evening Primrose, Sundrops
Description: Large, brilliant golden flowers open from bright orange buds. Intense green, hairy foliage turns reddish in fall. Blooms all summer.
Zone: 4
Specifics: Full Sun Partial Shade

OPHIOPOGON chingii 'Sparkler'
(oh-fee-oh-POE-gon) (ja-PON-ih-kus)
OPHISP3
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Common Name: Lilyturf, Mondo Grass
Description: Fine-leafed dwarf with rich, deep green leaves adorned with sparkling white flowers followed by blue berries. A must for the small or miniature garden. Species corrected from japonicus.
Zone: 5
Specifics: Full Sun Partial Shade Ground Cover

OPHIOPOGON planiscapus 'Niger'
(oh-fee-oh-POE-gon) (plan-iss-KAP-us)
OPHINI5
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Common Name: Black Mondo Grass
Description: RHS Award of Garden Merit. Distinctive, very dark purple foliage with pale lilac-pink flowers July-August. Slow growing edger, ground cover, or contrast plant with Hosta or other paler foliage plants. Best in part shade and moist soil, but will tolerate full sun.
Zone: 5
Specifics: Full Sun Partial Shade Ground Cover

ORIGANUM laevigatum 'Herrenhausen'
(oh-RIG-an-um) (lay-vih-GAY-tum)
ORIGHE3
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Common Name:
Description: RHS Award of Garden Merit. Sub-shrub with small, aromatic leaves. Profusion of small, cerise-pink flowers and red-purple bracts. Spectacular in late summer and fall.
Zone: 5
Specifics: Full Sun Butterfly

ORIGANUM libanoticum
(oh-RIG-an-um) (li-ba-NO-ti-kum)
ORIGLI3
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Common Name: Hopflower Oregano
Description: 2004 Plant Select®. Vigorous, trailing herb with hops-like bracts of lavender and chartreuse throughout the summer and fall. Looks best cascading over a raised bed, rock garden, or container. Needs well-drained site.
Zone: 4
Specifics: PlantSelect Full Sun Partial Shade Ground Cover

ORIGANUM rotundifolium 'Kent's Beauty'
(oh-RIG-an-um) (ro-tun-di-FO-lee-um)
ORIGKB3
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Common Name: Kent's Dittany
Description: Semi-prostrate, branching stems covered with hops-like pods and lavender florets in summer and fall. Needs well-drained soil. Incredible in containers or growing over a boulder.
Zone: 6
Specifics: Full Sun

ORIGANUM x 'Amethyst Falls'
(oh-RIG-an-um)
ORIGAF3
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Common Name:
Description: An outstanding, long blooming selection by Harlan from seed produced in the Kelaidis' garden several years ago. In addition to amethyst flowers flowing abundantly from ornamental, hops-like cones and attractive, textured, glaucous leaves this drought resistant plant's foliage fills the garden air with its exciting, spicy scent.
Zone: 5
Specifics: Full Sun Hybrid

OROSTACHYS aggregeatus
(or-oh-STAK-ees) (ag-GREG-ee-a-tus)
OROSAG3
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Common Name: Dunce Caps
Description: Neat, green, succulent rosettes from the Far East for the rock garden. White creamy flowers in late summer. No wet feet in winter.
Zone: 5
Specifics: Rock Garden Full Sun

OROSTACHYS iwarenge
(or-oh-STAK-ees) (iwa-renge)
OROSIW3
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Common Name: Dunce Caps
Description: Choice, low, gray, succulent rosettes.
Zone: 5
Specifics: Rock Garden Full Sun

OROSTACHYS malacophyllus
(or-oh-STAK-ees) (ma-la-KO-fill-us)
OROSMA3
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Common Name: Dunce Caps
Description: Very large rosettes of pale green with young pups on the underside. An eye-catcher for the rock garden.
Zone: 5
Specifics: Rock Garden Full Sun

OROSTACHYS spinosus
(or-oh-STAK-ees) (spine-OH-sus)
OROSSP3
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Common Name: Dunce Caps
Description: One of the finest. Similar to miniature Sempervivum and appears to have a white leaf margin. Stunning plant in the trough or rock garden.
Zone: 4
Specifics: Rock Garden Full Sun

ORTHOSIPHON aristatus
(or-tho-SY-fon) (a-ris-TAH-tus)
ORTHAR4
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Common Name: Cat's Mustache
Description: Oblong clusters of tubular, white flowers with distinctive, long, protruding stamens. Hairy, toothed leaves used medicinally in some parts of the world.
Zone: 9
Specifics: Full Sun Partial Shade Hummingbird Butterfly

OSTEOSPERMUM 'Avalanche' PP# 22,705
(oss-tee-oh-SPERM-um)
OSTEAV3
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Common Name: Avalanche White Sun Daisy
Description: 2011 Plant Select®. Dazzling white flowers with a coppery backing from April through summer. Mats of lustrous, nearly succulent, evergreen foliage. Greater disease resistance and heavier bloom than other sun daisies. Propagation Prohibited.
Zone: 4
Specifics: PlantSelect Full Sun Partial Shade Ground Cover

OTHONNA capensis
(o-THON-a) (ka-PEN-sis)
OTHOCA3
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Common Name: Little Pickles
Description: Blue-green, cylindrical leaves with stems of bright yellow daisies above foliage. A succulent Senecio selection for the sunny rock garden brought from Drakenberg Mountains of South Africa by Denver Botanic Garden's Panayoti Kelaidis.
Zone: 5
Specifics: Rock Garden Full Sun

OXALIS crassipes 'Rosea'
(oks-AL-iss) (KRASS-ih-peez)
OXALRO3
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Common Name: Strawberry Oxalis
Description: Showy, rose-pink flowers on this hardy oxalis for shade. Limited supply.
Zone: 5
Specifics: Partial Shade Full Shade