The government is considering a law against harmful chemicals used to control weeds and pests in lawns and gardens.
Dave Hinton with Landscape Manitoba says such a ban would make it nearly impossibe for homeowners to maintain their lawns.
Hinton says people take pride in their properties and should send the postcards to the government to say they don't agree with the province's plan.
Conservation Minister Gord McIntosh has said there's been decision on whether to bring in an outright ban or something less severe.
Josh Brandon with the Green Action Centre says there are other alternatives to toxic products.
"There's organic alternatives. There's programs that you can use to make sure that your lawn stays green. And you don't have to rely on toxic chemicals to do that."
Hinton says that's not the case.
"Everybody says there's all these alternatives, but actually there's really just one for weed control, and it's not that effective, and it costs a lot more," he said.
"Sure, the rich can still afford it, but the average homeowner has a real hard time handling weeds on their lawn."
Ontario and Quebec already have bans on harmful lawn chemicals.
(CJOB, The Canadian Press)