Oenothera 'Silver Blade' is a stunning evening primrose with huge, lemon yellow flowers for months atop silver-blue foliage.

Olea europaea 'Leccino' is thought to be the hardiest of all olives.

Olea europaea 'Manzanillo' is a the most important Spanish olive. It originated near Seville.

Carpets of small, forget-me-not blue flowers with white edges.

Onoclea sensibilis is a large, deciduous sensitive fern with long-stalked, deeply pinnatifid, bright green, fronds.

Ophiopogon 'Black Beard' is taller growing than 'Nigrescens' to one foot high forming fuller, more vigorous clumps.

Opuntia aurea 'Coombes Winter Glow' is a hardy evergreen Prickly Pear with bright pink flowers and green pads that turn dark purple in winter.

'Peachy' is a beavertail cactus (Opuntia basilaris) with glowing deep pink flowers on powder blue pads.

Opuntia basilaris var. brachyclada 'San Bernardino' is a cylindrical-leaved beavertail prickly pear cactus.

Opuntia basilaris x violacea has large, light blue pads that flush with pink.

Opuntia fragilis 'Alberta Sunset' has yellow flowers aging to apricot and pink with nearly spineless pads.

Opuntia fragilis 'Dwarf Golden' has small 1/2" pads with golden glochids & spines and yellow flowers.

Opuntia fragilis 'Jason Owens' is a handsome form with dark green pads and few to moderate thorns.

Opuntia fragilis 'Little Grey Mound' has yellow flowers, reddish-brown spines and green pads that turn bluish-purple in the winter.

Opuntia fragilis 'Michigan Tiny Form' is a peculiar dwarf form with cylindrical pads an inch long by a 1/4" wide.

'Neon Gold' is a likely hybrid involving Opuntia fragilis with golden spines & pads and golden flowers with salmon tints.

Opuntia fragilis 'Pender Island Form' is a lovely, vigorous form that hails from BC's Gulf Islands.

Opuntia fragilis 'Red Hill' has large, fat pads with long white spines.

Opuntia fragilis 'Texada Island Form' is a robust form with quite large pads with large white thorns.

This form of Opuntia fragilis can blush with purple, especially in winter, contrasting with the orange and white spines.

Opuntia fragilis var. denudata 'Bronze Beauty' is a nearly thornless form with rounded pads with orange glochids.

Opuntia fragilis var. denudata 'Potato' is a thornless fragile prickly pear with fat rounded pads that turn purple in winter.

'San Juan Grey' is a hybrid of Opuntia fragilis and O. erinacea with grey-green, flattened pads with short black & grey spines.

Opuntia gilvescens 'Oklahoma Pancake' has large, rounded, green pads that look like pancakes, small golden spines, and yellow flowers.