Home
Become a member
Menu
Search
Membership
Become a member
Home
Menu
Search
Get involved
Gardening
Shows
Gardens
Learn
Science
Shop
About
My RHS
Membership
Become a member
Home
My RHS
Get involved with the RHS
Back
Take action
Back
Get involved with RHS
Horticulture Matters
Wild About Gardens
National Gardening Week
Schools
Volunteer
Communities
Back
Community gardening
Britain in Bloom
It's Your Neighbourhood
Community Outreach
Campaign for School Gardening
Affiliated Societies
Find a local gardening group
Join the RHS
Back
Individual & Joint membership
Gift
Life & Senior Life
Students
RHS Patrons
About membership
Activate gift membership
Support us
Back
Donate
Careers
Commercial
Leave a gift in your will
Sponsorship and Partner opportunities
Gardening
Back
Gardening with the RHS
RHS Grow app
Plants
Back
Find a plant
Popular plants
Houseplants
Plants by type
Buy plants online
RHS trials & awards
Horticulture Hub
Advice
Back
Search all advice
Grow Your Own
This month
Problems, pests & diseases
Beginners' guide
Garden design
Gardening for the environment
Wildlife gardening
Health & wellbeing
My Garden
Browse inspiration articles
Buy plants online
Shows
Back
RHS Botanical Art and Photography Show
— 19 June – 2 August 2026
RHS Badminton Flower Show
— 8-12 July 2026
RHS Sandringham Flower Show
— 22-26 July 2026
RHS Hyde Hall Flower Show
— 5-9 August 2026
RHS Wisley Flower Show
— 1-6 September 2026
Malvern Autumn Show
— 25-27 September 2026
RHS Malvern Spring Festival
— 6-9 May 2027
RHS Chelsea Flower Show
— 18-22 May 2027
Exhibit at a show
See all RHS events
Gardens
Back
RHS Gardens
RHS Bridgewater, Greater Manchester
RHS Harlow Carr, Yorkshire
RHS Hyde Hall, Essex
RHS Rosemoor, Devon
RHS Wisley, Surrey
RHS Partner Gardens
RHS Flower Shows
Find a garden
What’s on
Learn
Back
Learning
Back
Courses & Workshops
Bursaries
Schools
Children and young people
RHS Libraries
Qualifications & training
Back
Grow careers
RHS Qualifications
Find an approved centre
Work-based training
Master of Horticulture
Grow Careers
Courses calendar
Science
Back
RHS Science & Collections
Research areas
Meet the team
Help our research
Herbarium
What’s on
Shop
Back
Visit the RHS shop
Shop plants —
rhsplants.co.uk
Shop prints —
rhsprints.co.uk
RHS Gifting —
rhsplants.co.uk
Gift cards and vouchers
Special offers
Our shops & garden centres
Other stockists
About us
Back
About us
What we do
Our people
Support us
Careers
Commercial
My RHS
Back
Log in
Register
Close
Find out more
RHS Home
Plants
Dahlia
'Union Jack' (Sin)
Save to My Plants
Close modal
Save a plant
Where do you want to save
Dahlia
'Union Jack' (Sin)
?
Plants I own
Wishlist
Add New List
Cancel
Save
Go to My Plants
CN
Collection name
Synonyms
Dahlia
'Star of Denmark'
Botanical Details
Family
Asteraceae
Native to GB/Ireland
No
Genus
Dahlia are tuberous rooted perennials with pinnately divided leaves and showy flowerheads, double in many cultivars, in summer and autumn
Name Status
Accepted