Trade Sales Contact Us
Primrose
My wheelbarrow

Shop

Information & Help

My account

Dahlia Imperialis | Tree Dahlia
Dahlia Imperialis | Tree Dahlia

Dahlia Imperialis | Tree Dahlia

SKU: BU30003122
1 × tuber
£7.99
Available to order from summer
3 × tubers
£20.00 £6.67 each
Available to order from summer
1

Pot size guide

Delivery van
Delivery options
Bulbs (only) £4.99

Buy now pay later

Check items to add to the cart or
Thermal Extra Grip Gardening Gloves Latex All Purpose Sage Med by Smart Garden
Kent & Stowe Hand Bulb Planter
Total Price

£0.00

Overview

This towering, tree-like perennial can reach up to 3m and it needs a long growing season to reach flowering height. If you fancy a change from sunflowers, why not have a go at growing this impressive, long-stemmed, and highly floriferous pink tree dahlia? Great fun to grow, why not pop one or two tubers in your basket and take the plunge? One last thing, if growing as a cut flower, you may wish to have a step ladder handy!

Specifications

  • Position: full sun
  • Soil: fertile, humus-rich soil
  • Rate of growth: average
  • Flowering period: July to September
  • Hardiness: half hardy (will need winter protection)
  • Bulb size: I
  • Toxicity: Ornamental bulbs should not be eaten by humans or pets

Eventual height & spread

Eventual height and spread

Care guide

Plant Dahlia imperialis outside after frost, or start off in pots under glass in late winter to early spring. Plant them horizontally approximately 12cm deep, making sure the growing points ('eyes') are uppermost. Allow plenty of room between each tuber so the plants can grow and spread to their full size without being overcrowded. While in growth, provide a high-nitrogen liquid feed each week in June, then a high-potash fertiliser each week from July to September. Stake with a cane if it becomes necessary (it may be worth installing a sturdy stake when planting to avoid root disturbance). In mild areas, leave them in situ over winter, but protect the crown with a generous layer of dry mulch. In colder areas, carefully lift and clean the tubers once the first frosts have blackened the foliage and allow them to dry naturally indoors. Then place the dry tubers in a shallow tray, just covered with slightly moist potting compost, sand or vermiculite and store in a frost-free place until planting out again.

Warning

Humans/Pets: Ornamental bulbs - not to be eaten

How your order will arrive

Packaging
Bulbs arrive in bags placed in small cardboard boxes. Material may vary.

About Primrose

About Primrose

Primrose is the place to be to Discover Everything Garden.

We were created in 2003 to become the UK's largest online-only garden centre. Thousands of plants, planters, awnings, garden furniture sets, water features and more line our digital shelves, and we're ready to fill your garden with comfort, quality, colour and style.

If you'd like to find out more, check out our 'About Us' page.

Reviews

Q&A

Contact us
Terms
Privacy
Cookies

© 2026 Cercis Ltd. All rights reserved | Primrose is the trading name of Cercis Ltd (Registration number: 14521244)