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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
While we update our systems with the new hardiness ratings you may still see old
hardiness ratings in your search results. These are denoted as 'Old'.
For full details of the hardiness ratings see
AGM plants have been through a rigorous trial and assessment programme. They are:
L. stoechas subsp. stoechas is an aromatic dwarf shrub to 60cm tall, with narrow, grey-green leaves and short-stalked, dense, ovoid heads of tiny blackish-purple flowers surmounted by a tuft of purple bracts
'Loddon Blue' is a compact plant to 50cm in height, with narrow, grey-green leaves and deep blue-purple flowers
'Loddon Pink' is a compact bushy shrub with narrow greyish leaves and short, fragrant, dusky pink flower spikes in summer
'Sawyers' is a bushy evergreen shrub to 60cm, with linear, silvery-grey-green leaves and spikes of light purple flowers in mid summer
'Alba' is a robust evergreen shrub to 1m or more, with linear, grey-green leaves and long spikes of pure white flowers
'Imperial Gem' is a compact evergreen shrub with narrow grey-green leaves and fragrant spikes of deep purple flowers in summer
'Richard Gray' is a compact evergreen shrub to 50cm, with relatively broad, silvery-grey foliage and spikes of deep purple flowers
'Grosso' is an evergreen shrub to 90cm tall, with narrow, grey-green foliage and long-stemmed, very aromatic, deep bluish-purple flower heads in summer
Prostratus Group are compact evergreen shrubs of prostrate habit, with linear, aromatic leaves and blue flowers in small axillary clusters in spring and summer, occasionally in autumn
'Nana Alba' is a bushy compact evergreen shrub to 30cm, with narrow grey leaves and white flowers in short spikes in late summer
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