Here in zone 5, we might be at or beyond the northern edge of where it likes to grow. I found one website saying it was a hardy perennial in zones 8-9 and an annual in zones 2-7. Another website says it is hardy in zones 6-11. Another says it is an annual in zones 3-7; perennial in 6-11.
Despite its latitude being similar to Chicago's, New York City is in zone 7. Toronto; that's a mystery to me. I would think that it would definitely be colder there than here, but apparently it's zone 5 according to the Canadian system, which is equivalent to zone 6 in the American (USDA) system.
On the bright side, it appears to be easy to grow from seed in full sun in pots or beds. Indeed, it might be for the best that it grows well as an annual, because apparently, in zones where its hardy, unless it's confined to pots, it can spread like mint and take over garden beds.
"Your swimming suit matches your eyes, you hold your nose before diving, loving you has made me bananas!"