Both species, which choke out native vegetation, are listed as weeds of national significance.
Wheatbelt NRM has organised a free, half-day workshop in York today.
ABC TV personality and Gardening Australia presenter Josh Byrne will make an appearance and discuss how to prevent environmental weeds escaping from your garden.
Byrne will also provide advice on gardening in the Avon region.
Wheatbelt NRM’s project officer Greg Warburton said tamarisk originated from the Middle East and was introduced to Australia as a garden plant and salt tolerant re-vegetation species.
‘This weed is also found upstream of bridges where it was planted to protect pylons during flooding,’ Mr Warburton said.
Bridal creeper was introduced from southern Africa as an ornamental plant.
The workshop will help people identify Weeds of National Significance and how to control them. ‘A frightening fact about bridal creeper is it has 90 per cent of its biomass underground, consisting of a massive tuber system, which helps it to survive droughts,’ Mr Warburton said.
‘Controlling these weeds requires lots of physical work, with back pack spraying and chain sawing.’
A team employed by Wheatbelt NRM has spent months walking hundreds of kilometres of the Avon Valley from Beverley to West Toodyay plotting infestations.
Pockets of tamarisk and bridal creeper have become so thick that native vegetation cannot survive.