Join the RHS today and support our charity
Free personalised gardening advice
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Reduced prices on RHS Garden courses and workshops
020 3176 5800
Mon – Fri | 9am – 5pm
Help us achieve our goals
Make a donation
I have forgotten my password
Keep me signed in
Register for free to receive our newsletters, add comments to blogs/articles and to save content.
See what events are on near you and browse your bookmarked pages.
Inspiring days out and so much more
We have combined these two powerful search tools into a single Find a Plant service searching over 250,000 plant records.
Virtually all of the features of the old searches are still available and in addition we have added several new features to create a more comprehensive and user friendly search experience.
When using this search
Search by plant name, key attributes or both to find plant details and a list of
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.
the RHS today and get 12 months for the price of 9
Other common names
Cape primrose 'Harlequin Blue'
Streptocarpus can be annuals, perennials or subshrubs, with usually wrinkled, lance-shaped to rounded leaves and clusters of tubular to trumpet-shaped flowers with 5 spreading lobes, often borne throughout the year
'Harlequin Blue' is a compact cultivar with short flower stems to 4.4cm and neat leaves. Flowers are distinctive with yellow lower lobes, which hold their colour well, soft blue upper lobes and very dark purple lines in the throat defining the extent of the two colours. Winner of the RHS Chelsea Flower Show Plant of the Year in 2010. Shortlisted for Chelsea Plant of the Centenary in 2013 for the decade 2003-2012
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
Aspect South-facing or East-facing
MoistureMoist but well-drained
SoilSand, Clay, Chalk
pHAcid, Alkaline, Neutral
Time to ultimate height
Grow under glass in loam-less compost in bright filtered light. Allow compost to dry between waterings. Remove faded flower stalks to discourage seedlings
Propagate by seed or leaf cuttings
Suggested planting locations and garden types
Patio & Container Plants
Pruning No pruning required
Pests May be attacked by leafhoppers, mealybugs, thrips, vine weevil and tarsonemid mite
Generally disease free
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
Cape primrose 'Harlequin Blue'
Buy from £19.99 at 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.
Join the RHS today and get 12 months for the price of 9