9-inch or 12-inch grid spacing for Clematis trellis??
My Dh is making me a cedar trellis to attach to the garage wall for an existing clematis to climb. I do not know what the exact cultivar is, but it's a large-flowered variety, not 'paniclulata' or other small-flowered.
I'm designing the trellis, which will be a standard grid, and wondering whether a 12" spacing on the grid is OK, or whether clematis prefer smaller, like 9" spacing.