Abutilon megapotamicum will bloom constantly from spring until fall with bright yellow and red pendulous lanterns.

Abutilon pictum 'Thompsonii' is a flowering maple that produces masses of peach bells set off by the yellow-spotted foliage.

The upright stems of Abutilon 'Biltmore Ballgown' are festooned with dangling two-inch orange bells streaked with scarlet throughout summer.

Abutilon 'Nabob' produces masses of large, rich red, pendulous lanterns from spring through fall.

Acanthus mollis 'Hollard's Gold' is a very special bear's breeches with new leaves emerging gold or chartreuse.

Acanthus 'Whitewater' forms vigorous mounds of variegated foliage and pink stems holding white flowers.

Acanthus 'Morning Candle' is very free-flowering with extra tall and stately spires of mauve bracts and white flowers up to four feet tall.

Achlys triphylla is a unique ground cover attractive to pollinators and hummingbirds. The dried three-part leaves smell like vanilla.

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 'Medusa' is an incredible variegated succulent with glowing red with deep burgundy leaves.

Aeonium 'OuJiali Variegata'/'19' is a unique variegated succulent with thick chocolate brown foliage with pale yellow edges.

Aeonium 'Red Fuji'/'22' is a rare variegated succulent with broad, thick green foliage flushed and striped with burgundy.

Bottlebrush buckeye, Aesculus parviflora, is topped with dramatic summer spires up to 12 inches high of tubular white flowers.

Agapanthus 'Back in Black' is a hardy lily-of-the-Nile with black stems, black buds, and dark purple-blue flowers followed by black seed pods.

Fireworks of rich cobalt blue flowers on dark stems atop lush, green foliage.

Agapanthus 'Blue Heaven' produces large heads of blue flowers throughout summer. Rebloomer.

'Blue Yonder' is reported hardy to zone 5 and has big, luscious heads of royal blue flowers from July to September. Let's go ROC ("Rest of Canada")! Give it a try.

Agapanthus Fireworks is a striking lily-of-the-Nile with bicolour flowers of violet blue and white.