Plant Reference Guide

Perennials O

 
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Reference Guide Contents

Perennials A1 |A2|B|C|D|E|F|G|H|Hosta|I|J|K|L|M|N|O|P|Q|R|S|T|U-V |W-Z

 Ferns | Grasses | Roses | Trees & Shrubs | Vines  | Edibles  | Annuals

Click on small images for larger views of plants.

 

Oenothera

missouriensis

 

Oenothera sp. 'Siskiyou'

 

Oenothera 'Glowing Magenta'

 

 Origanum Amethyst Falls

 

Origanum Kent's Beauty

 

Orostachys iwarenge

 

Othonna capensis

 

Oxalis crassipes 'Rosea'

OENOTHERA, PrimroseSun/part shade; blooms May-Aug.

 

macrocarpa/missouriensis.  10"; large deep yellow flowers; sprawling plant with glossy leaves; native.

 

speciosa, Showy Evening Primrose.  18"; large pink cup-shaped flowers; vigorous; native to Missouri.

 

s. ‘Siskiyou.’  Same as above only shorter; shear for rebloom.

 

tetragona, ’Fireworks.’  18"; bright cup-shaped flowers on red tinged foliage; tolerates shade.

 

t. ‘Crown of Gold.’  Yellow-edged green leaves are topped by clear yellow flowers. Great for cut flowers and are attractive to hummingbirds. Deer resistant. Height 8-10”.

 

‘Twilight.’  An excellent form of Showy Primrose that distinguishes itself by its striking rich purple, bronze leaf coloring.  The deep coloring makes a strong contrast to the large pink flowers which appear throughout the summer.  Excellent for borders, containers or as a patio plant.   It is particularly stunning when planted with plants with yellow flowers or foliage. 

 

‘Yella Fella.’  Large, brilliant golden flowers open from bring orange buds. Intense green, hairy foliage turns red in fall. Bloom ALL SUMMER!! Height 16”, spread 20-24”.

 

OPHIOPOGON, Mondo Grass.  Best in part shade.

 

planiscapus ‘Ebony Knight’.’ A grass like perennial with dense, purplish black foliage.  Evergreen.  Black berries are produced amoung the foliage.  Slow grower, to 6 inches tall.  Spreads.  Grow in full sun to part shade.

 

p. (nigrescens) ‘Niger,’ Black Mondo Grass.  Distinctive, very purple dark foliage to 6”.  

 

ORIGANUM, Oregano.  Sun.  Needs well drained soil.

 

rotundifolium ‘Kent’s Beauty.’  Semi-prostrate branching stems covered with Hop-like pods and lavender florets in summer and fall.  To 14”.  Incredible in containers or growing over a boulder.  Chosen as a ‘Plant of Merit’ by the Missouri Botanical Garden for its outstanding qualities.

 

‘Amethyst Falls.’  Amethyst flowers flow from abundant ornamental hops-like cones.  Attractive, textured glossy foliage fills the garden air with its exciting spicy scent.  Drought tolerant, 8-12” plants spread to 2’.

 

‘Bistow Cross.’  Small round silver-grey leaves. Small purple flowers drip from lime-green pink-tinged bracts.

 

OROSTACHYS, Dunce Caps.  Sun.

 

minutum.  Small tight rosette of tiny purple gray leaves.  Unusual and interesting flowers look like a pointy hat. 

 

spinosa:  One of the finest.  Like a miniature Sempervivum, and appears to have a white leaf margin.  Stunning in the trough or rock garden.

 

OSTEOSPERMUM, Hardy Sun Daisy.  Sun/part shade; needs well drained site.

 

b.c. ‘Lavender Mist.’  Large 3” lavender purple daisy-like flowers from early spring until fall.  Chosen as a ‘Plant Select’ for its outstanding qualities.

 

OTHONNA, Little Pickles.  Sun; excellent rock garden plant.

 

capensis:  3-4”; blue-green cylindrical leaves with stems of bright yellow daisies; a succulent selection for the sunny garden from the Drakenberg Mountains of South Africa.

 

OXALIS, Perennial Shamrocks.  Ahade to part shade.

 

crassipes (O. articulata) ‘Alba’, ‘Garden Hardy White.’  Pure white long blooming 4-6” stoutly branched plant with trifoliate green leaves.

 

c. ‘Blush.’  Same fantastic long bloomer as ‘Alba’ and ‘Rosea’ except for the pretty delicate pink flowers.  Trifoliate green foliage, 4-6”.

 

c. ‘Rosea’, Garden Hardy Pink,’ Strawberry Oxalis.  4-6”; showy rose-pink flowers on hardy plants.

 

Perennial Common Name Cross Reference Guide