Black-eyed Susan
Acanthaceae - Thunbergia alata

What does it look like?

A vine that can grow to a height of 1.8-2.4 m. It has twinning stems with heart or arrow-shaped hairy leaves. It favours sun to partial shade. Soft orange and black five-petal blooms appear in late Spring/early summer, mid summer and again in late summer, early autumn.  Black-eyed Susan is known for producing flowers as early as six weeks after germination. The leaves are heart shaped dicotyledons. 

Why is it a problem?

A garden escapee found growing down banks and smothering native vegetation. Prolific seeder in warmer areas of New Zealand.

Control Methods

Physical control

  • Can be hand removed and care needs to be taken to dig out all the roots. The green waste will probably need to be disposed of in an appropriate manner.