Argyranthemum frutescens
Rounded sub-shrub with bright green leaves, daisy-like white flowerheads with yellow centres.
Argyranthemum gracile ‘Chelsea Girl’
Compact sub-shrub with green-grey thread-like leaves, daisy-like white flowerheads with yellow centres.
Argyranthemum maderense
Compact sub-shrub with deeply toothed, greyish-green leaves, daisy-like lemon-yellow flowerheads with yellow centres.
Arisaema amurense
Tuberous perennial with a purple stem and usually one leaf. Bears hooded spathes with dark purple and white stripes in spring.
Arisaema candidissimum
Tuberous perennial bearing a sweetly scented pink-striped white spathe in summer followed by a solitary leaf.
Arisaema flavum
Tuberous perennial with two bright green leaf s. Small greenish yellow to bright yellow spathes in summer.
Arisaema tortuosum
Tuberous perennial with two to three green leaf s. Hooded green spathes in spring or early summer.
Arisaema triphyllum
Tuberous perennial with one or two green leaf s. hooded green sometimes purple-striped spathes in spring or early summer followed by clusters of red berries in autumn.
Arisarum proboscideum
Mats of arrow-shaped, glossy, dark green leaves. In spring hooded, dark brown -purple spathes with long tails.
Aristea ecklonii
Vigorous, clump-forming perennial with linear leaves. Loose spike-like panicles of blue saucer-shaped flowers.
Arnica montana
Clump-forming perennial with lance-shaped leaves and deep yellow daisy-like flowerheads.
Artemisia ‘Powis Castle’
Woody-based perennial with feathery, silver-grey leaves. Panicles of silver yellow-tinged flowerheads.