I doubt your heat is much different from ours. But your call.
Actually St Louis heat is pretty awful.
Rhubarb is pretty widely adapted though, but I think the main thing is that there are all sorts of rules about shipping biological materials across state and international lines.
Yeah - the biggest rule is to label the package as craft supplies, ship bare root, and wrap in wet paper towels. (Not my first rodeo ;). I remember bringing a trunkload of plants back from Tennessee once and getting pulled over to secondary inspection at the border - the guy asked what the plants were, I answered with the latin names, he rolled his eyes and let us through. The best part was that we had a ziplock bag full of shamrock corms in the glove compartment - the guard threw it on the ground and with an accusing look asked what it was.
"Oxalis Triangularis Corms - they make a supercool red shamrock"
"Oh." Opens trunk - "What are these?"
"Heleborus Foetidous - an early spring ephemeral that are going to be pretty marginal in Ontario." (They ended up doing really well)
"Fine, just go."
This was around 10 years ago, I've moved plenty of unusual plants since then, never had trouble as long as the plants were bare root.
Toronto heat is pretty brutal. You southern guys might be surprised. Not unusual to get up into the 90°F's and over 100°F with humidex due to moisture off lake Ontario. I spent 2 summers in Atlanta and found the summer longer but not altogether different. We get about a month of extreme heat from late July to mid-end of August. St Louis likely has more tornadoes though.
We're way off topic now though. And you're probably right anyways. We're going through our stock of rhubarb pretty well - the kids keep snacking on it as it grows. To us thats great costs nothing and it's a lot healthier than some of the alternatives.
