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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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ORIGANUM x 'Amethyst Falls'
(oh-RIG-an-um) | ORIGAF3 |
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| 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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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