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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.
'Godfrey Owen' is a rhizomatous perennial, up to 90cm high, with glaucous leaves and lemon-scented, ruffled flowers in early summer. The flowers have standards that are pale yellow edged with darker yellow, while the falls are white edged with yellow, and the beards bright yellow-orange
'Yellow Queen' is a cultivar of the vigorous, clump-forming species. In May and June it bears exaggeratedly spurred flowers, the central petals being dark yellow, the outer flower parts contrastingly lighter. Foliage is mid green, divided and fern-like
'Orange Glory' is a robust perennial to 1.5m in height, with light green foliage and terminal umbels of red-tipped orange-brown flowers, the inner segments deep yellow, tipped with orange-brown
'Lemon Drops' is a bulbous perennial to 40cm tall, with about three nodding pale lemon-yellow flowers per stem, the cup slightly deeper yellow than the somewhat reflexed perianth segments
B. salicifolium is a compact perennial to 60cm tall, with erect stems bearing willow-like leaves and yellow flowers 6cm across from early summer
S. reticulata low-growing, prostrate deciduous shrub forming a wide patch to 12cm high. Leaves 2-4cm, rounded, rich glossy green above, with impressed veins; glaucous beneath. Male catkins erect, 2cm, are borne with the leaves
H. × moserianum is a spreading dwarf deciduous shrub with arching red stems and ovate leaves. Flowers to 5cm in width, golden-yellow with reddish anthers
'Wessex Tang' is a half-hardy perennial to 70cm in height, with lemon-yellow flowers 8cm across, lightly tinged with orange, the disk orange-yellow
L. vulgare is a rhizomatous perennial with dark green spoon-shaped leaves and solitary white, daisy-like flowerheads with yellow disk florets, in late spring and early summer
?Winter Orange? is a selection of this medium-sized deciduous tree that has red buds and orange winter shoots. Leaf colour in autumn is butter-yellow. Small, fragrant creamy-white flowers are borne in spreading clusters in summer
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