Looks like a Phlox. Possibly Phlox subulata Tamaongalei.syn with P.s. Candy stripe. http://www.srgc.org.uk/wisley/2008/100608/Phlox subulata Tamaongalei.jpg http://www.amazon.co.uk/Phlox-subulata-Candy-Stripe-Tamaongalei/dp/B002U5WJFM
Thanks! I have 4 plants in a backyard in Calgary - zone 3. The flowers are sparse. The masses of flowers on pictures on the web sure look nice. I'll read up to see if I can help it grow better.