Calgary Carpet is at the top of list for being tough as nails. Cold hardy, Dry hardy, wind hardy............ Dog pee might be its kryptonite though. It has medium green branches that spread sideways and mound up on top of each other. Great for garden edges, by the driveway or road where the conditions are rougher.
Cold Hardiness - Hardy in temperatures down to -40C. Sizing - A 5' spread in 10-15 years is a reasonable estimation, feel free to prune once a year to keep in in the 2-3' range. Location - Full sun to 75% shade, moist to dry conditions, wind hardy.