Alkaline Soil

A deciduous tree 15-20 m (50- 65 ft.) in height, it has dark-brown, rough bark and obviate, toothed, deeply-veined leaves....

A small perennial, on a creeping rhizome, 15-20 cm (6-8 in) in height. The bright-yellow, dandelion-like flowers, borne singly, appear...

In South America it is a perennial, but in Europe and cool temperate regions it is a half-hardy annual. It...

A hardy, deciduous tree, to 25 m (82 ft) in height, with a large rounded crown, it has smooth, silver-grey...

A hardy perennial, 30-60 cm (1-2 ft.) tall, it has ovate to heart-shaped, pale-green, and soft-textured leaves and inconspicuous greenish-yellow...

A shrubby, evergreen perennial, 10-30 cm (4-12 in) in height, it has creeping roots and dark-green, glossy foliage, shaped like...

A perennial which grows on a stout taproot to 30 cm (1 ft.) long, it has a basal rosette of...

A bushy, hardy perennial, to 1 m (3 ft.), with bright-green, pungently aromatic, pinnately-lobed leaves and a mass of white...

A dioecious shrub, up to 2 m (6 ft.) in height, with leathery, ovate leaves, it is the only species...

A strong-smelling perennial on a stout, knotted rhizome, 40-80 cm (16-32 in) n height, it has ovate to lance late...