Abelmoschus manihot 'Auntie Lilli's' is an edible salad bele tree with beautiful tri-coloured foliage and hibiscus-like flowers.

Abelmoschus manihot 'Chief Kubo's Prize' has deeply cut palmate leaves and hibiscus-like, light yellow flowers. Both are edible.

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.

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

Acanthus hungaricus 'White Lips' is a dramatic bear's breeches with spikes of light plum hoods and wide, white lips.

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

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

Acer campestre 'Carnival' makes a stunning specimen in container or garden with its compact size and variegated leaves.

Acer 'Morning Starburst' is an elegant addition to the garden that offers spectacular burgundy and red tones in the fall.

The paperbark maple, Acer griseum, is a distinctive species with beautiful exfoliating bark and fall colour.

Acer palmatum 'Tsukasa Silhouette' is a vigorous upright deciduous tree with a very narrow form with small green leaves and brilliant fall colour.

Acer palmatum 'Ukigomo' or floating cloud Japanese maple is the most spectacular of variegated cultivars.

Acer palmatum 'Ukigomo' or floating cloud Japanese maple is the most spectacular of variegated cultivars.

Achillea filipendulina ‘Gold Plate’ is a yarrow that produces masses of large golden-yellow flowers on tall stems.

Achillea Desert Eve 'Deep Rose' is a yarrow with dark pink flowers with yellow centres above fragrant, fern-like foliage.

Achillea millefolium 'Heartthrob' has large, flat-topped flower clusters with colourfast, velvet-red flowers above dissected, fern-like foliage.

Achillea millefolium 'New Vintage Red' has large, flat-topped flower clusters of bright red with white centres.

Achillea millefolium 'New Vintage White' has large, flat-topped flower clusters of pure white eyes flowers.

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

Achillea 'Coronation Gold' is an award-winning yarrow with masses of flat-topped, golden yellow flowers.

Achimenes 'Blue Sparks' is an orchid pansy related to the African violet with delicate white to lavender/blue tubular blooms.

Achimenes 'Cattleya' is an orchid pansy related to the African Violet with delicate violet-blue tubular blooms and lighter throats.

Achimenes 'Charm' is an orchid pansy related to the African Violet with delicate rosy-pink tubular blooms.

Achimenes 'Peach Blossom' is an orchid pansy related to the African Violet with delicate light pink tubular blooms and magenta throats.