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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.
'Valerie Finnis' is a deciduous bulb to 25cm tall, with leaves appearing in autumn, and dense racemes of pale blue flowers in spring
'Christmas Pearl' is a bulbous perennial producing tightly packed spikes of bright blue, fragrant flowers in winter. The leaves start to grow in autumn and may reach 30cm by spring, though they tend to flop over
'Peppermint' is a clump-forming, bulbous perennial, to 15cm tall, with strap-shaped foliage and, in spring, densely packed flower spikes with small, sweetly fragranced, pale blue flowers turning white at the tip of each spike
'Monroe White' is a clump-forming perennial with dark, evergreen, strap-shaped leaves and upright spikes of white flowers in autumn
M. azureum is a compact bulbous perennial to 10cm in height, with narrow, channelled leaves. Small, bell-shaped pale blue flowers, each segment having a darker central stripe, are borne in dense racemes
'Siberian Tiger' is a bulbous perennial, 15-20cm tall, with green, strap-like leaves and dense racemes of fragrant, white flowers opening from green buds in spring
M. latifolium is a deciduous bulbous perennial to 20cm, with a single leaf to each bulb, with dense racemes of deep blue-black flowers in spring, topped by a grown of pale violet sterile flowers
'Joyce Spirit' is a deciduous, bulbous perennial, to 12cm tall, with green, strap-like leaves and dense racemes of striking, deep royal-blue flowers, edged with white, in spring
'Bling Bling' is a bulbous perennial, to 15cm in height, with green, strap-like leaves and dense racemes of bell-shaped, violet-blue flowers, with pale-blue to white petal edges, in spring
'Blue Magic' is a clump-forming, bulbous perennial to 20cm high with linear, semi-upright leaves. In spring, erect stems bear dense heads of small, urn-shaped, blue flowers rimmed with white
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.