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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.
'Sky' is a herbaceous perennial 1.5m high with deciduous strap-shaped green leaves and flowerheads of long, tubular, sky-blue flowers, darker near the tips, which hang down as they open in late summer
'Lilac Time' is a clump-forming herbaceous perennial to 1m tall with strap-shaped foliage. Sturdy, upright stems bear dense heads of trumpet-shaped, pale lilac flowers in summer
Plants grown as Agapanthus africanus 'Albus' are evergreen perennial with narrow, erect leaves and long-stemmed umbels of white, trumpet-shaped flowers in late summer
'Lilliput' is a compact herbaceous perennial to 45cm tall, with narrow leaves and erect stems bearing a rounded cluster of funnel-shaped dark blue flowers in late summer
'Black Pantha' is a semi-evergreen, clump-forming cultivar growing up to 1m tall. Deep blue-black flowers emerge from almost black buds in summer, forming flowerheads up to 20cm across held above the foliage on erect stems
'Angela' is a vigorous herbaceous perennial to 1.2m tall with strap-shaped leaves; in summer, heads of slightly nodding, pale blue, funnel-shaped flowers are borne on strong stems
Brilliant Blue is a relatively compact herbaceous perennial, growing to about 50cm tall, with clumps of strap-shaped green leaves. This cultivar flowers freely in the summer producing loose clusters of rich sky-blue flowers with a darker stripe running through each petal
A. campanulatus subsp. patens is a clump forming herbaceous perennial to 1.2m, with narrowly strap-shaped, greyish-green leaves and erect stems bearing umbels of widely trumpet-shaped, blue flowers from late summer
'Windsor Grey' has an unusual, subtle flower colouring in a shade between palest lavender and grey, with hints of green from the pollen colour and the green bases of individual flowers; flowers can appear from July to September. This cultivar is reasonably tough and hardy
'Tinkerbell' has narrow, evergreen leaves striped with cream along their length. The blue flowers are produced very sparingly in mid to late summer
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