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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.
'Thai Sita' has a neat, upright habit, growing to about 30cm. The leaves are narrow and dark green and the stems deep purple. The flowers are purple and white, with dark purple bracts
'Knightii' is an evergreen shrub or small tree to 4m in height or more, with large elliptic leaves and pendulous, fragrant, hose-in-hose double, white flowers to 30cm in length
A. kolomikta is a large vigorous deciduous climber with twining stems. Leaves ovate, those of mature plants tipped with silver, later pink. Flowers white, male and female on separate plants. Grown for foliage effect
'Langdon's Blue Lagoon' is an erect, vigorous perennial to 195cm, branching and floriferous, with large green leaves. Spikes to 90cm long, flowers 7cm across, mid-blue with white eyes
M. boaria is an evergreen tree potentially to 20m, but in Britain usually a small tree or large shrub, 3-10m, tall with an oval crown and slender, drooping branches. Leaves are narrowly lance-shaped, 5cm long, shining mid-green above and paler beneath. Flowers greenish-white, small and inconspicuous, numerous, borne in leaf axils in spring and fragrant. May be followed by small, red, 2-seeded fleshy fruits
?Schneekrone? is a low, spreading plant to 60cm high and 150cm wide. Flower buds are pale pinkish?purple; wavy-margined flowers, white flushed pink fading to white, some maroon spotting on upper lobe. Stigma pink. Very floriferous
'Prune Damson' is a vigorous, but neat growing, cultivar that has larger fruits than 'Farleigh Damson'. A regular and good cropper with a picking time of late August. A late flowering cultivar in pollination group 5, so should escape spring frosts. Self-fertile
'Pearl' is an evergreen perennial with strap-shaped, wrinkled leaves. This cultivar is free-flowering over a long season, bearing up to ten clear white flowers with a pale yellow throat on each flower stem
'Variegatum' is a bushy evergreen shrub with ovate leaves margined with yellow, and small white flowers in winter and early spring
'February Silver' is a dwarf Trumpet cultivar, to 20cm in height, with green, strap-like foliage, creamy-white outer petals and a contrasting pale-yellow trumpet. Flowers in early spring
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