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All ratings refer to the UK growing conditions unless otherwise stated. Minimum
temperature ranges (in degrees C) are shown in brackets
AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
M. cervina is a clump-forming, semi-evergreen perennial to 30cm tall with slender, lance-shaped, aromatic leaves and whorls of pale blue to lilac flowers from midsummer into autumn
M. pulegium is a highly aromatic, creeping perennial producing a mix of upright and spreading stems. Tiny lilac flowers are produced in whorls in summer
M. spicata is a vigorous rhizomatous perennial forming an extensive colony of erect stems bearing spearmint-scented, lance-shaped leaves, and small light purple flowers in interrupted terminal spikes
'Black Mitcham' is a spreading perennial to 40cm tall and 90cm wide with strongly aromatic, oval, pointed and toothed dark green leaves flushed with bronze and dark red. Small, pale purple flowers form dense terminal spikes from summer into autumn
'Variegata' is a strong-growing perennial forming an extensive colony to 40cm tall, with softly hairy, apple-scented pale green leaves margined with cream, and tiny mauve flowers in dense spikes in late summer
M. × piperita f. citrata is a strong-growing perennial forming a wide colony of dark purple stems bearing oval leaves tinged with purple, and scented like Eau de Cologne, with tiny pale purple flowers in dense spikes in late summer
'Upright' is a herbaceous perennial 30cm or more high with mostly upright stems and some prostrate spreading stems, narrowly elliptic to rounded, sharply aromatic, slightly toothed, bright green leaves, to 3cm long, and whorled spikes of lilac flowers in summer; the leaves can be used as a culinary and medicinal herb, but should not be taken by pregnant women; it also acts as an insect repellent
M. spicata var. crispa is an aromatic perennial to 60cm, spreading by creeping rhizomes. The leaves are bright green, broad and crinkled. Whorls of tiny, pale purple flowers appear on terminal spikes in summer
M. × piperata is a strongly aromatic, herbaceous perennial with stems and leaves flushed with purple. It produces terminal spikes of tiny, pale purple flowers in late summer
M. longifolia is a spreading perennial, to 1.2m, with hairy, green to grey-green leaves with a musty, minty smell. Branched, tapering spires of tiny, pale purple or white flowers are produced in mid- to late summer
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