Opuntia 'Baby Rita' is stunning with blue-green, purple-flushed pads and multi-coloured flowers.

Opuntia 'Cyclops'has rounded pads with few spines & only brown glochids like polka-dots with cheerful yellow flowers.

Opuntia 'Dark Knight' has striking pads in shades of purple and green that can become all purple in cold weather.

Opuntia 'Peach Chiffon' produces marvelous peachy pink flowers with slightly darker centres.

Opuntia 'Red Gem' has small, round, 2-3 inch wide pads with short spines and deep pink to magenta flowers.

Orostachys ‘Chinese Hat’ is a succulent hybrid that forms succulent rosettes of pale silver/grey foliage with yellow flowers.

Orostachys japonica is a hardy rosette succulent with many cylindrical, pointed, light green leaves that can flush orange.

Osmanthus fragrans has fragant white flowers aging to yellow. Used in China in teas and desserts.

Osmanthus fragrans f. aurantiacus has small, orange, extremely fragrant, edible flowers famous in China for use in teas and other foods.

Osmanthus fragrans f. thunbergii has small, pale yellow, extremely fragrant, edible flowers famous in China.

Osteospermum 'Avalanche' is a super hardy African daisy that blooms from spring until fall with masses of large, dazzling white daisies.

Othonna capensis or little pickles is an extremely hardy ground-covering succulent with blue-green leaves and yellow daisy flowers.

The redwood sorrel, Oxalis oregana, is a lovely native shade ground cover with beautiful shamrock foliage.

Oxalis oregana 'Klamath Ruby' is a special redwood sorrel with darker green leaves with wine red undersides.

Pachyphytum bracteosum 'Silver Jelly Bean' is an Echeveria relative with thick, oval, silver-blue leaves and yellow flowers.

Pachyphytum compactum has thick, rounded, pointed, grey-green leaves with white crystal-like markings.

Pachyphytum oviferum is a gorgeous succulent with palest silver blue, rounded, balloon-like leaves that can flush pink.

Pachyphytum rzedowskii has cylindrical, succulent leaves with pointed tips in shades of bluish white flushing purplish.

Pachyphytum bracteosum is an Echeveria relative with thick, rounded, silver-blue leaves.

Pachyphytum 'Blue Haze' has broad, flattened, rounded, succulent leaves that can be silver blue or flush with pink.

Pachyphytum 'Pink Bunny' has broad, flattened, succulent leaves that can be palest silver blue or flush with pink with a little stress.

Pachyphytum 'Solomon' is an Echeveria relative with thick, cylindrical, powder blue, succulent leaves with pointed tips.

A great alternative to the standard Pachysandra terminalis , P. procumbens also has fragrant flowers and more attractive foliage.