Dahlia imperialis

Dahlia imperialis

Tree dahlia

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Flowers
Flowers

Plant does not flower in January

Plant does not flower in February

Plant does not flower in March

Plant does not flower in April

Plant does not flower in May

Plant does not flower in June

Plant does not flower in July

Plant does not flower in August

Plant does not flower in September

Plant does flower in October

Plant does flower in November

Plant does flower in December

  • Botanical name: Dahlia imperialis
  • Common name: Tree dahlia
  • Family: Asteraceae
  • Plant Type: Perennial, Deciduous
Flower colour:

Pink

Foliage colour:

Green

Giant dahlia or tree dahlia, Dahlia imperialis, is an enormous species growing to 3m, bearing thick, bamboo-like stems and large, elder-like leaves. It makes a fantastic foliage plant in its own right, however, if grown in a sheltered spot in a mild region, it may bear single, pink-purple blooms with orange-centres, from late October onwards. It’s a great choice for a tropical border but may also be grown in a large greenhouse or conservatory, where its chances of flowering are greatly increased.

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Grow Dahlia imperialis in moist but well-drained soil in a sheltered spot in full sun. There’s usually no need to stake. As with all dahlias, lift the tubers and store over winter. 

How to grow Dahlia imperialis

  • Plant size

    3m height

    1.5m spread

  • Aspect

    South facing, west facing

  • Sun exposure: Full sun
  • Hardiness: Tender
  • Soil type: Well drained / light / sandy

Plant calendar

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Plant
Plant

Do not Plant in January

Do not Plant in February

Do not Plant in March

Do not Plant in April

Do Plant in May

Do Plant in June

Do not Plant in July

Do not Plant in August

Do not Plant in September

Do not Plant in October

Do not Plant in November

Do not Plant in December

Flowers
Flowers

Plant does not flower in January

Plant does not flower in February

Plant does not flower in March

Plant does not flower in April

Plant does not flower in May

Plant does not flower in June

Plant does not flower in July

Plant does not flower in August

Plant does not flower in September

Plant does flower in October

Plant does flower in November

Plant does flower in December

Dahlia imperialis and wildlife

Dahlia imperialis has no particular known value to wildlife in the UK.

Is Dahlia imperialis poisonous?

Dahlia imperialis has no toxic effects reported.

No reported toxicity to:

No reported toxicity to Birds

No reported toxicity to Cats

No reported toxicity to Dogs

No reported toxicity to Horses

No reported toxicity to Livestock

No reported toxicity to People

Plants that go well with Dahlia imperialis