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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.
'Gertrude Jekyll' is an evergreen perennial to 10cm in height, forming a compact mat of small, dark green ovate leaves, with abundant, pure white flowers 2-2.5cm in width
V. difformis subsp. sardoa is an evergreen, spreading perennial to 40cm tall with glossy, dark- green leaves with paler veins. Milky, pale blue flowers 5-7cm across are borne on erect stems in late winter and early spring
'Variegata' is an evergreen sub-shrub to 45cm in height, forming a clump of erect leafy flowering stems and long prostrate rooting stems, with ovate leaves margined with cream. Flowers violet-blue, 4-5cm in width, opening from spring to autumn
V. difformis is a vigorous, prostrate evergreen sub-shrub with rooting stems bearing ovate, evergreen leaves, and short upright leafy stems with pale whitish-blue flowers 4cm across, in late winter and early spring
V. major is a vigorous evergreen sub-shrub forming a clump of erect stems bearing glossy ovate leaves and solitary violet-blue flowers 4cm wide in the leaf axils, with long rooting sterile stems making effective ground cover
'Bowles's Variety' is a vigorous, evergreen mat-forming perennial to 20cm in height, with dark green, ovate leaves and violet-blue flowers 2.5-3cm in width
'Argenteovariegata' is a vigorous mat-forming evergreen perennial to 10cm in height, with greyish-green ovate leaves margined with creamy-white, and light violet-blue flowers 2-2.5cm in width
'Ralph Shugert' is an evergreen, trailing shrub which roots as it spreads. The foliage is dark green with a narrow white border and the large flowers are vivid, deep violet
'Illumination' is a prostrate evergreen perennial with bright yellow, ovate leaves narrowly margined with dark green, and violet-blue flowers 2.5cm wide over a long period from mid spring to early autumn
'Azurea Flore Pleno' is a prostrate evergreen perennial to 15cm in height, with dark green ovate leaves and double, sky-blue flowers 2-2.5cm in width
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