Join the RHS today and support our charitable work
Free personalised gardening advice
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Free entry to RHS members at selected times »
Reduced prices on RHS Garden courses and workshops
020 3176 5800
Mon – Fri | 9am – 5pm
Help us achieve our goals
Join the RHS today and support our charity
Begin a new search
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.
'Silk Road' is a small, deciduous shrub to 1.5m, with light green, pinnate leaves with small, rounded leaflets. Pea-like, lilac-pink flowers are produced in upright spikes from late spring to late summer
I. heterantha is a medium-sized deciduous shrub, herbaceous in colder areas and then making up to 1.2m annual growth. Leaves pinnate with 13-21 small leaflets. Flowers 12mm, rosy-purple, in racemes to 12cm in length from early summer
I. pendula is an upright, deciduous shrub, to 3m, with arching branches bearing blue-green leaves, up to 15cm long, each with 15 or 17 leaflets. The wisteria-like flowers are rosy-purple, in hanging sprays, up to 25cm long, produced from mid-summer to autumn
I. amblyantha is a medium-sized deciduous shrub with pinnate leaves composed of 7-11 small, oval leaflets. Flowers light pink, 6mm in length, in dense erect racemes to 10cm in length
Last-listed in the RHS Plant Finder in 2012
This plant is listed in the RHS Plant Finder book. At present our information about this plant is limited to a list of the nurseries that supply it. In time we will be adding more details including a description, growing information, advice and photographs.
Over 72,000 plants and where to buy them
Britain’s best gardening annual, available now from RHS Mail Order and all good bookshops.
Choose from hundreds of plants, bulbs, seeds and gardening products from our online shop.
Save now on all plants
& bulbs from the RHS Plants Shop
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.