In a home garden situation plants can be hand-weeded or mown. Whichever control methods are selected it is vital that they occur before flowering to reduce seed production. Seeds can form even after treatment with herbicide or weeding if the plant is already in flower so dispose of hand pulled weeds in the garbage. Regular spraying of pastureland with selected herbicides may help control fireweed. The herbicide should be applied on young plants before flowering.
More chemical is required on flowering or mature plants and control is less effective.
Some pests and a fungus already attack the weed but will not control it. Improving pastures to increase competition against the weed is also important for on-going control. A Pest Fact sheet is available from the Department of Natural Resources in Queensland on fireweed, which is a declared weed in that state. To receive information contact the department direct. Photocopies would however be available from your local NSW Agriculture office or by phoning the head office.