I continue to be amazed that saxifrage can overwinter in Calgary when it is planted into a tiny, shallow hole in hypertufa. It just doesn’t seem right. The plant itself is so tiny and the hypertufa rock sits in the trough, exposed to all of the elements, a pretty regular freeze and thaw cycle and our typical week of -40° that happens each winter.
But what a trooper, look at these little marvels. Two of three planted last year have settled in. The holes are drilled about a half inch wide and a couple of inches deep. The planting medium is sand with a little compost, top dressed with forestry grit. The roots of the plant are placed into the hole and the medium is gently added. I use tweezers and a thin metal rod to poke down the soil mix and nestle in the tiny plant. I water, cross my fingers and voila, it worked.