Acaena inermis 'Purpurea' is an excellent ground cover for crawling over gravel paths or stones with gorgeous purple-blue-grey foliage.

Acaena saccaticupula 'Blue Haze' is an excellent ground cover with powder blue foliage.

Achillea tomentosa ‘Goldie’ is a woolly yarrow that produces clusters of yellow flowers on top of evergreen, fuzzy foliage.

Adiantum raddianum 'Fragrantissimum' is an evergreen maidenhair fern with arching black stems and light green aromatic fronds.

The evergreen Himalayan maidenhair fern, Adiantum venustum, forms delicate and elegant, slowly expanding mats.

Adiantum x tracyi is a rare hybrid fern with black stems and lacy, bright green fronds. Sure to delight in the shade garden.

Andromischus clavifolius 'Indian Clubs' forms clusters of pointed, cylindrical, light green to yellowish green, red-mottled, succulent leaves on narrow stems.

Andromischus cooperi var. festivus has plump, nearly cylindrical, succulent, grey leaves with purple blotches and lobed tips.

Andromischus marianiae Antidorcatum Group forms clusters of long, cylindrical, light green, pointed, succulent leaves with bold red spots.

Andromischus marianiae 'Herrei' is one crazy succulent with pointed, cylindrical, purple-red leaves completely covered in bumpy, warty projections.

Andromischus subdistichus is a cute little succulent with short branching stems tightly packed with circular leaves.

Aeonium aureum (syn. Greenovia aurea) is known as green rose buds because, when dry, the leaves curl up into a tight rose bud like shape.

Aeonium aureum (syn. Greenovia aurea) ex. El Hierro is a large form of the green rose buds with blue-green leaves.

Aeonium aureum (syn. Greenovia aurea) 'Gran Canaria' is a large form of the green rose buds.

Likely Aeonium (Greenovia) dodrantale forming multi-branching colonies of small rose buds.

Aeonium 'Phoenix Flame' is a stunning architectural succulent with pointed, bold reddish burgundy leaves around green centres.

Aeonium arboreum var. rubrolineatum is an intriguing cultivar with green leaves variably streaked with burgundy.

Aeonium 'Zwartkop' is one of the best succulents for pot culture with burgundy rosettes on stems from 1-3 feet tall.

Aeonium castello-paivae is a dwarf, branching, succulent forming cute mounds of variegated rosettes.

Aeonium haworthii forms small branching shrubs of succulent rosettes with fleshy, spoon-shaped leaves.