Prime Minister Justin Trudeau announced Wednesday that marijuana will be legal nationwide on Oct. 17. In the meantime, Canada's provinces and cities are working out issues concerning how cannabis will be regulated.

Here's what to expect:

GOVERNMENT-RUN STORES

It's up to the provinces and territories to determine how to handle distribution, and they're taking a variety of approaches.

Ontario plans to open up to 150 stores run by its Liquor Control Board — a model of public ownership that is unusual in the U.S. The tiny Washington state town of North Bonneville has one city-owned pot shop.

British Columbia is planning for a mix of public and privately owned stores, while Newfoundland and Saskatchewan will have only private pot shops. In some remote areas where stand-alone marijuana stores might not be economically feasible, including in the Northwest Territories, cannabis could be sold at existing liquor stores.

Just like U.S. states with legal pot, the provinces also differ on home-growing, with many allowing up to four plants and others, including Quebec, barring it.

And rather than a minimum age of 21, as U.S. states have set, Canada's federal minimum age to use marijuana will be 18, with most provinces adding an additional year.

The varying approaches make the provinces something of a laboratory for determining the best ways to legalize, said Matt Gray, founder and chief executive of Herb, a Toronto-based news and social media platform for the pot industry.