Blue Thunbergia

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Thunbergia grandiflora


This is a vigorous perennial twining vine which grows to 15 metres. The branches are 4 angled.

Leaves are up to 15 centimetres long and 10 centimetres wide and are arranged opposite each other along the stem. They are broad-based narrowing to a pointed tip, usually with deeply scalloped lobes towards the base.

Flowers are trumpet shaped as a short, broad tube, which is white on the outside and yellowish inside. It expands to 5 rounded pale lavender-blue petals which are up to 8 centimetres long. It flowers throughout the year.

Seed pods are cone shaped, 3 to 5 centimetres long with a rounded base. The seed is flat, small and covered with brown scales.

Roots are tuberous and can grow to 70 kilograms.

Habitat it is found in lowland rainforest and river systems, cleared land, and monsoon vine thickets

Weed characteristics it forms impenetrable colonies. It climbs and blankets native vegetation often pulling down mature trees with its weight. It limits natural growth of lower layers of vegetation. It spreads quickly, and the large tubers may cause damage to structures.

Dispersal plant segments can be transported in soil or fill as well as floodwaters along river banks.

Declaration Details

This species is a Class 2 declared plant under Queensland legislation.

How to act

A broad leaf herbicide should be used, however due to the underground tubers the plant often persists. Cut stumping can be used to allow access to large infestations. Hand pulling plant material will usually require follow up foliar spraying of regrowth. Care should be taken to monitor site as underground tuberous root system can often need direct injection of herbicide to completely control infestation.

Refer to Weed Control Methods.


Related information

Blue Thunbergia © NQ Dry Tropics 2011
Blue Thunbergia © NQ Dry Tropics 2011

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