Common name


Scientific Name

Dietes grandiflora

Type of plant

Bulbs or Corms

About this weed

Unfortunately, this perennial plant is still widely sold in plant nurseries throughout the Perth Region. Whilst it was introduced as a waterwise garden plant it also has invaded urban bushland. The plant will spread by seed as it produces massive amounts of seed each year or through the dumping of garden waste in bushland.  Control in bushland is usually done by digging the rhizomes and removing flower heads before the seeds develop.


Dietes are rhizomatous perennial plants with long, rigid, sword-like green leaves. They can grow to 1.2 m in height. The flowers are white with yellow and violet markings. They are produced in abundance during summer, especially after rain. Flowers are followed by 5 cm long green capsules that contain the seeds. This species is common in horticulture in its native South Africa, where it is often used in public gardens, beautification of commercial premises and along roadsides.

Impact on Bushland

If left Dietes will spread over bushland and impact on ecological processes and plant communities.


Dietes has become a weed of bushland close to urban areas. It is still widely used as a waterwise plant.

Priority for removal

High: may become a major threat to conservation values anywhere it has taken hold.

Management (hand)

Control in bushland is usually done by digging the rhizomes and removing flower heads before the seeds develop.

Management (herbicide)

Not available.

Flowering month/s

January, February, November, December

Flower colour/s


Information source

Additional information

Hussey, B.M.J., Keighery, G.J., Dodd, J., Lloyd, S.G. and Cousens, R.D. (2007) Western weeds. A guide to the weeds of Western Australia, Second Edition, The Weeds Society of Western Australia, Victoria Park, Western Australia.

Dietes images


Donations and support from the wider community help us to protect and campaign for our Urban Bushland.

Make a donation

newsletter Signup

Get the latest news and key events delivered to your inbox.

Become a Member

We are a peak environmental group in WA. One of our key strengths is our amazing group and individual members.

Become member

Urban Bushland Council WA Inc

2 Delhi Street West Perth WA 6005

PO Box 326 West Perth WA 6872

(08) 9420 7207 (please leave a message)

Send this to a friend