State biosecurity officers are warning Wimmera farmers, as a weed poisonous to humans and livestock returns for another year.
Cape tulip (one-leaf), Moraea flaccida and cape tulip (two-leaf), Moraea miniata, flower in September and October.
Agriculture Victoria said in a statement every part of the plan, even when dry, was possibly deadly.
Agriculture Victoria Leading Biosecurity Officer Michael Moerkerk said the plants were easiest to identify when flowering.
"The plants typically flower from September to October so now is the time for farmers to identify if their property is infected with either species," Mr Moerkerk said.
The flowers of both species look similar with six pink-salmon coloured petal-like segments with a yellow centre.
Stems are usually zig-zagged in appearance and grow to 75 cm high.
Both species have long strap-like leaves and as the name implies, cape tulip (one-leaf) has only one leaf per plant, whereas cape tulip (two-leaf) has two to three leaves per plant.
Mr Moerkerk said there were two control methods to remove cape tulip from an infected area.
These were the application of a registered herbicide, or the physical removal of the entire plant, including the roots (and corms), from the soil.
In a statement, Agriculture Victoria said Cape tulip (one leaf) is a declared Regionally Controlled Weed in the Wimmera Catchment under the Catchment and Land Protection Act 1994.
This means all landowners have a responsibility to take all reasonable steps to prevent the growth and spread of cape tulip on their land.
Agriculture Victoria said in its statement more information could be found on its website: agriculture.vic.gov.au/biosecurity/weeds/priority-weeds, or by calling 136 186.
"If you suspect livestock have cape tulip poisoning call your private veterinarian or contact Agriculture Victoria and ask to speak to a district veterinary officer or animal health officer in your region," it said.
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