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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.
'Cambridge Blue' is a compact annual to 15cm, forming a low hummock of narrow foliage, with clear light blue, two-lipped flowers 2cm across in summer and autumn
Cascade Series are trailing annuals to 15cm, with neat foliage and usually white-eyed flowers 2cm across, in shades of blue, violet, mauve, pink and crimson as well as white
'String of Pearls' is a spreading annual to 25cm in height, with neat foliage and flowers in shades of light and deep blue, purple or white, some with a white eye
Techno Heat Trailing Light Blue Improved is a low-growing plant, with stems to 30cm long, small narrow leaves and a spreading habit. The two-lipped flowers, 2cm across, are light blue with a white eye, produced abundantly in summer and autumn
'Mrs Clibran' is a compact annual to 15cm, with bright blue, white-eyed flowers 2cm across in summer and autumn
'Regatta Sky Blue' is a trailing perennial to 15cm, with neat foliage and white-eyed, pale blue flowers 2cm across in summer and autumn
Waterfall Blue is a trailing annual, 10-15cm in height and 20-30cm wide, with small, dark green foliage and flowers 2cm across in summer and autumn. The mid blue-purple flowers have three prominent lower lobes and white throats
'Riviera Blue Eyes' is a bushy annual to 25cm in height, with conspicuously white-eyed, deep violet-blue flowers in summer and autumn
'Colour Cascade' is a trailing annual with small, dark green foliage and flowers 2cm across in summer and autumn, in shades of blue, purple, red and white
'Crystal Palace' is a compact annual with small, dark bronze-green foliage and deep blue flowers 2cm across in summer and autumn
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