I just checked Garden Watchdog and Wayside doesn't have the best rating. Any thoughts on that as well.

I'm assuming it's getting good sun. Otherwise, I suspect that there is some problem at the roots (maybe involving the soil). How's the drainage? I'd be tempted to pot it up in some decent soil and just grow it containerized. It should be growing like a weed at this point.

Welcome to Alberta : ) . I moved here from NYC about 25 years ago, and though I don't have to deal with Calgary chinooks (we're about 3 hours east of Edmonton), gardening here is a challenge, especially because every year has different weather. It takes a lot of work, a lot of research, and a lot of trial and error. My best advice is to find local gardeners and learn everything you can from them, and don't try to replicate a very different climate. I've had very good luck overwintering mandevilla for several years. For me it seems to do better if I keep it in the basement and basically ignore it, rather than keeping it on a windowsill in the living room and tending it carefully through the winter. Jasmine has done well for me overwintering on the windowsill. I start bringing all of my tender tropicals, including mandevilla and jasmine, into the house in September. Yes, you can plant shrubs now. It'll give them time to get established before frost. Gardening in Calgary is unique, different from gardening in Edmonton and other parts of the province. Get a copy of "The Calgary Gardener: The Essential Guide to Gardening in Alberta's Chinook Country", by the Calgary Horticultural Society, which I would considering joining -- they have a magazine for members, Calgary Gardening, and also have classes and coaching workshops, and tours. Another helpful book is "The Chinook Short Season Yard: Quick and Beautiful in the Calgary Region" by Lyndon Penner. The spreader roses I think are supposed to be rated to zone 3 if I recall correctly. It's always worth a try, I think, as long as there's room in the budget and in the garden : ) . For roses, the book "Growing Roses in Calgary" from the Calgary Rose Society is a very good resource. This is a good blog for Calgary/Alberta gardening, https://floweryprose.com.  One important thing to remember -- just because it's sold at your local nursery, greenhouse, Home Depot, etc. does not mean it's suitable for local conditions. Some are much too tender and should just be treated like annuals. Because of the chinooks, you will have to do a lot of experimentation.

They could be the same plant floral. I just answered with what showed up from searches. I guess he just wanted the cultivar names, which is kind of like asking what cultivar your orange daylily is. Most people are happy just calling them Mandevilla. There are about 190 species of Mandevilla, while Hosta, and Hemerocallis each have only about 20 species. With so many Mandevilla species that can be used or hybridized, and humans doing selective breeding to achieve every color of the rainbow, who can say for sure what is what?