Hello, We just moved to Oliver, BC in the South Okanagan last December from the Lower Mainland. I'm loving our huge new backyard and all the gardens. I'm slowly learning about all the plants in the garden, but one has me and everyone I've asked stumped. It's a low speading plant that is located in a rock garden in our south-facing backyard. Small pale purple flowers appeared at the beginning of July. From May 'til July it has spread over the whole left side of my garden as shown in the pictures. Can anyone help me figure out what the plant is? Many thanks.