Help us achieve our goals:
make a donation »
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
A magical gift that grows all year
020 3176 5800
Mon – Fri | 9am – 5pm
Make a donation
Join the RHS today and support our charity
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.
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
Siberian iris 'Perry's Blue'
Iris sibirica 'Perry's Blue'
Iris may be rhizomatous or bulbous perennials, with narrow leaves and erect stems bearing flowers with 3 large spreading or pendent fall petals, alternating with 3 erect, often smaller, standard petals, in late winter, spring or early summer
'Perry's Blue' is a clump-forming perennial, to 85cm in height, with slender strap-like grey-green leaves and striking sky blue flowers with white markings borne in early summer
Toxicity Ingestion may cause severe discomfort
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 West-facing or East-facing
Exposure Exposed or Sheltered
MoistureMoist but well-drained
SoilClay, Loam, Chalk, Sand
Time to ultimate height
This cultivar is perfect for planting by a sunny waterside in moist but well-drained (not waterlogged), neutral to slightly acidic soil. Looks stunning planted in bold clumps. Plant in soil that has been improved with well-rotted manure or garden compost and do not allow to dry out, particularly as the plant is getting established
Divide clumps in early spring or autumn. If planted in a container, it will need dividing and re-potting every couple of years in spring
Suggested planting locations and garden types
Flower borders and beds Low Maintenance
City & Courtyard Gardens Cottage & Informal Garden Patio & Container Plants Coastal
Pruning Deadhead after flowering. Cut back foliage in autumn
Pests Slugs and snails may be a problem
May be affected by aphid borne virus diseases
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
Siberian iris 'Perry's Blue'
Buy from £5.99 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