Orbea hardyi
Low, creeping with trailing speckled stems. Grayish-green with mottled purple. Starfish-shaped carrion flowers with bowl-shaped center. Protect from frost.
Sun
Oreocereus celsianus
Tree cactus to 12ft. tall covered with long white hairs. Branches from the base. low growing.
Oreocereus doelzianus var. sericatus
Morawetzia sericata
Exceptionally attractive white-furred, broze-spined cactus from high altitudes where the fur protects it from scorching sunlight and frosts. Slow, but will clump with age, carmine colored tubular flowers.
Oreocereus ritteri
Fog hardy, slow basally clumping to 5ft x 10ft wide
Oreocereus trollii
Andean, fog hardy. Exceptionally attractive white-furred and bronze-spined cactus from high altitudes where the hairs will protect it from UV and frosts. Slowly clumping to 30″t. Red flowers.
Origanum “Herrenhausen”
Evergreen Herbaceous Perennial
Small purple flowers sprays cover the stems in summer and through the fall. Groundcover with erect stems.
Origanum “Hopley’s Purple”
Herbaceous Perennial
Mild-tasting. Vibrant flower clusters spring through fall. Excellent choice for rock gardens and borders. Deer resistant.
Origanum “Kent Beauty”
O. rotundifolium “Kent Beauty”
Herbaceous Perennial
Excellent choice for rock gardens and hanging baskets. Cuttings can be dried and used in crafts. Deer resistant. Cut back hard in winter.
Origanum “Monterey Bay”
Evergreen Herb
Fragrant ornamental oregano with blue-grey foliage and pink flowers in summer. Likes well-draining soils and moderate water.
Origanum microphyllum hybrid
Evergreen Herb
Low growing, mounding. Tiny fragrant green leaves. Lavender-pink flowers. Great in rock gardens and mixed pots.
Ornithogalum caudatum
Winter-growing bulb, 4″ caudex, w/strappy leaves to 3ft.
Ornithogalum dubium
Beautiful spring bulb in the Scilloideae subfamily. Summer dormant. Has large sprays of orange or yellow flowers in the spring, strappy leaves through the winter. Frost tender. Can be unplanted for winter, replanted in spring. Keep dry when dormant.
Ornithogalum fimbriatum
Beautiful spring bulb in the Scilloideae subfamily. Summer dormant. Has initial low sprays of flowers in late winter, and a 2nd tall bloom stalk with large sprays of white flowers in the spring, strappy leaves through the winter. Frost tender. Can be unplanted for winter, replanted in spring. Keep dry when dormant.
Ornithogalum magnum
Deciduous Bulb
Non-invasive bulb good for naturalizing. Flower spikes of white star-shaped flowers appear in late Spring and can be up to 3ft tall, lasting a few weeks at a time. Dormant in Winter.
Ornithogalum saundersiae
Hyacinth bulb, 5ft. stalks w/white flowers, black centers Late winter blooming.
Orostachys iwarenge
Groundcover, lots of plantlets, pyramidal bloom stalks.
Orostachys japonica
Unusual rosette-forming succulent with pyramidal bloom stalks. Large clusters. Monocarpic, will bloom in the 2nd or 3rd year.
Oroya peruviana
Small, rare barrel to 8″ dia., pink flowers.
Ortegocactus macdougallii
Small, globular, to 2″across; black-tipped spines; requires limestone in soil.
Oscularia caulescens
Pairs of triangular leaves densely packed on stems. Blue-green leaves get purple edges in full sun. Reddish stems will get woody as they age. Small purple flowers in mid summer open in late afternoon heat. Grows 8-10″ tall, will spread 6 feet wide. Propagate by taking cuttings from new, soft stem tips only.
Oscularia deltoides
Low shrub; purple stems, boxy grey-green leaves. Winter-growing. Will get covered in small lavender daisy-like flowers in spring through the summer.
Osteospermum “3D Berry White”
Evergreen perennial
Showy two-tone daisy blooms, white petals with purple centers are attractive to butterflies. Great for cut flowers. Blooms spring through fall.
Osteospermum “3D Double Purple”
Evergreen perennial
Showy double purple daisy blooms are attractive to butterflies. Great for cut flowers. Blooms spring through fall.
Osteospermum “3D Sunburst”
Evergreen perennial
Showy double golden-yellow daisy blooms are attractive to butterflies. Great for cut flowers. Blooms spring through fall.
Osteospermum “4D Pink”
Evergreen perennial
Showy two-tone daisy blooms, pink petals with purple centers are attractive to butterflies. Great for cut flowers. Blooms spring through fall.
Osteospermum “4D Violet Ice”
Evergreen perennial
Showy two-tone daisy blooms, violet petals with white centers are attractive to butterflies. Great for cut flowers. Blooms spring through fall.
Osteospermum “Astra Orange”
Evergreen perennial
Orange daisy blooms are attractive to butterflies. Great for cut flowers. Blooms spring through fall.
Osteospermum “Astra Pink Spoon”
Evergreen perennial
Pink spoon flower daisy blooms are attractive to butterflies. Great for cut flowers. Blooms spring through fall.
Osteospermum “Astra Purple Spoon”
Evergreen perennial
Purple spoon flower daisy blooms are attractive to butterflies. Great for cut flowers. Blooms spring through fall.
Osteospermum “Bright Lights White”
Evergreen perennial
Bright white flowers with yellow centers. Great for cut flowers. Blooms spring through fall.