Plant

Tree Dahlia

Dahlia imperialis

Also known as Imperial Dahlia

Tree dahlias shoot up from underground tubers with astonishing speed, forming thick, hollow stems that resemble bamboo canes and reach high into the sub-canopy. In late autumn, clusters of large, nodding bell-shaped flowers in shades of pale lavender and pink bloom high above the foliage. In native montane cloud forests, these towering perennials die back to the ground after winter frosts before vigorously sprouting renewed canes each spring.

FloweringPerennialArborescent

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Near ThreatenedConservation status

Key facts

Diet & preyAutotrophic (photosynthetic)

Predators

Slugs and Snails
Spider Mites
Aphids

ThreatsDeforestation, habitat clearance, and agricultural conversion

HabitatsCloud forests, montane valleys, slopes, and disturbed forest edges

Life spanDecades (perennial tuberous rootstock)

Classification

FamilyAsteraceae
SpeciesDahlia imperialis

Range & activity

Range data is not available yet.

Safe observation

Interaction riskHigh

Low
Moderate
High
Very high

Why interaction risk is high: Toxic to dogs and cats if ingested; safe to observe at a normal distance.
Why it is dangerous: Contains polyacetylene compounds that cause mild gastrointestinal distress and contact dermatitis in dogs and cats.
How to recognize a risky encounter: Recognizable by giant, cane-like segmented stems topped with wide lavender composite flower heads.
What to do: Keep curious pets away from pruned stems or exposed tubers to prevent accidental chewing.

Responsible observation

Observation Timing: Look for expansive flowering displays in late autumn before the first hard freezes.
Wind Exposure: Avoid leaning against mature canes, as the brittle hollow stems can snap in strong winds.

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