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Dahlia 'Imperialis Tree Dahlia'

Giant dahlia, Imperial dahlia

Half-hardy Tuber

What is Half-Hardy Tuber?

Enormous wild species dahlia

Usually grown for its huge tropical foliage

Nodding mauve flowers produced in mild climates

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Description How to Grow More Info Delivery

This enormous wild species dahlia can reach up to three metres in a single growing season. Sporting huge, elder-like leaves of around a metre long held on impressive stems which resemble bamboo, Dahlia ‘Imperialis’ is usually grown as a foliage plant. Its jungly appearance makes it a magnificent specimen for a tropical border.

The flowers don’t appear until October, so it requires a warm position to bloom, either in a greenhouse/conservatory or a sheltered position in mild gardens, where the flowers won’t risk being prematurely cut down by frost. If you succeed at the challenge, you’ll be rewarded with pale mauve, yellow-centred flowers which nod down on you from an intimidating height!

Height: 3m (118in). Spread: 1.5m (59in).



Height Up to 300cm (118in)
Spread Up to 150cm (59in)

Half-hardy Tuber

cottage gardensexotic gardenspecimen plant

full sun

Flowering Months

1 Tuber (KF1831)
2 Tubers (KF1832)

Plant Dahlia tubers outdoors in April after all risk of frost has passed. Choose a sunny position in moist well drained soil. Prepare the soil by digging in plenty of well rotted manure or compost. Plant tubers at a depth of 15cm (6") and water well. Alternatively, start tubers into growth in pots of compost in a frost free greenhouse. Transplant them into their final positions outdoors in June.
Feed and water dahlias regularly throughout the growing season. While dahlia plants are still young, pinch out the growing tip of each stem to encourage bushier growth and masses of flowers. Deadhead faded dahlia flowers to encourage more blooms to be produced. Bedding dahlia are generally grown as annuals, however dahlia tubers may be lifted in autumn and stored over winter in trays of peat or sand, in a cool but frost free position if required. They can be potted up the following spring.

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

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