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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.
'Alexander' is a vigorous perennial forming a substantial clump of erect stems with lance-shaped leaves boldly margined with cream and often tinged pink, and bowl-shaped bright yellow flowers 2.5cm wide in the upper leaf axils in mid summer
L. punctata is a strong-growing herbaceous perennial forming a spreading clump of erect stems with lance-shaped, light green leaves, and with bowl-shaped, bright yellow flowers 2.5cm wide, in the upper leaf axils in mid and late summer
'Beaujolais' is a clump-forming, short-lived perennial to 60cm tall with silver-green, narrow, wavy-edged leaves up to 10cm long. Spikes of burgundy-red to dark purple flowers are borne in midsummer
Vigorous herbaceous perennial forming an extensive colony of erect stems to 1m in height, with narrow, greyish leaves. Small greyish-white flowers are borne in slender terminal spikes
Upright herbaceous perennial to 1m in height, with whorled, lance-shaped purple leaves and nodding, star-shaped yellow flowers 2.5cm across, in the upper leaf axils
L. ephemerum is an herbaceous perennial forming a clump of erect stems clad in narrow, grey-green leaves, with small, starry white flowers in long, slender terminal racemes in early summer
L. vulgaris is a hairy perennial that forms clumps by creeping stolons or rhizomes. Leaves are ovate, green, sometimes with black dots, and occur in groups of three or four. Yellow flowers are borne in terminal clusters in summer
Very vigorous evergreen perennial forming a wide mat of creeping stems clothed in small, rounded or ovate, golden-yellow leaves. Solitary, short-stalked, cup-shaped bright yellow flowers 2cm in width
L. nummularia is a mat-forming, hairless perennial with ovate to heart-shaped leaves that are held in pairs along the procumbent stems; they sometimes bear markings of black glands. Yellow flowers, with five pointed lobes, are borne in the leaf axils in summer
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