Water

Opuntia stenopetala

Shrubby prickly pear to 5′; medium red spines with many orange glochids

Opuntia sulphurea

3ft tall, can spread to 6ft wide, low growing spiny Prickly-Pear cactus. Can grow in clay soils. Spines are dense and hardened. Yellow flowers spring through summer.

 

Opuntia tuna-blanca

Tall, fast growing prickly pear; delicious fruit (tunas) creamy-white colored.

Opuntia undulata

Tall prickly pear to 10′, trunk to 12″; low-spine, edible pads/fruit

Opuntia violacea

O. macrocentra v. minor

Purple pads, low spreading, a few long black spines; Populations vary by location.

Opuntia x rooneyi

O. aureispina x O. macrocentra

Large bluish pads, long red spines

Orbea distincta

Sprawling segmented stems with protruding teeth. Large burgundy and yellow carrion flowers.

Orbea lepida

Stapelia lepida

Stems to 6″, starfish shaped carrion flowers to 3″

Orbea variegata

Stapelia variegata

Variable, stems to 12″; speckled carrion flowers to 6″

Orbeanthus hardyi

Orbea hardyi

Low, creeping with trailing speckled stems. Grayish-green with mottled purple. Starfish-shaped carrion flowers with bowl-shaped center. Protect from frost.

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 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 “Amethyst Falls”

Evergreen Herb

Huge sprays of cascading amethyst-colored blooms in mid summer make for a great rock garden plant or in a hanging basket.

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 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.