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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:
H. albicans is a dense, rounded, evergreen dwarf shrub forming a broad mound with small, glaucous, oblong leaves and short, dense spikes of white flowers in early summer
'Wiri Dawn' is a spreading dwarf evergreen shrub with narrow leaves and slender racemes of pale pink flowers in summer, often again in autumn
'Pewter Dome' is a compact, rounded dwarf evergreen shrub with grey-green, oblong leaves to 2cm long, and white flowers in dense spikes to 3cm long in early summer
'Red Edge' is a small evergreen shrub with oblong, blue-grey leaves which are margined with red, especially in winter. Flowers pale mauve fading to white, in short spikes
'Midsummer Beauty' is a medium-sized evergreen shrub to 2m in height, rounded in habit, with long narrow leaves tinged purple when young. Small lilac-mauve flowers, fading to white, are borne in racemes to 15cm in length in summer and autumn
'Emerald Gem' is a dwarf evergreen shrub making a compact rounded bush to 30cm tall, with upright shoots densely covered with tiny, pointed leaves, and small white flowers appearing sparsely in summer
'Margret' is a compact, rounded evergreen shrub with bright green foliage and light blue flowers in short racemes in early summer, often repeating in early autumn
'Sapphire' is an evergreen shrub with narrow dark green leaves tinged purple, and short racemes of rosy-mauve flowers in summer
'Silver Queen' is a bushy, spreading evergreen shrub to 1m, with broadly elliptic leaves margined with creamy-yellow to white; purple flowers 10mm across are borne in short racemes from midsummer to autumn
H. vernicosa is a rounded shrub of compact habit, with small, very glossy dark green leaves and axillary racemes of small white or very pale blue flowers in early summer
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