I planted some Cana tubers in the spring of 2004. Originally, I planted them around 8 or 10 inches
deep. Today I went out to trim them down for the winter, and found that in several of them, there
were large branched tubers with growth points on the surface or breaking through to the surface.

Is it normal for Cana tubers to migrate upwards like that? Would the original tubers still be "down
there" below the surface ones? I'm concerned about them freezing out now.