Trees, Shrubs and Conifers: Would clematis and chokeberry work here?, 0 by StPaulPeg

StPaulPeg wrote:
I'm trying to spend productive time this winter planning out next year's garden. I have an area on the south side of my yard that gets a little direct sun in the morning and late afternoon, but is shaded for most of the day by tall burr oak trees. I'm thinking of trying to grow a white flowered clematis along the fence, planting a black chokeberry (or maybe a viburnum) to the right of the oak, and then putting in a triangular mixed perennial bed in front of the shrub. I'm planning on moving the roses.

Would the size of the holes I'd have to dig to plant the clematis and chokeberry injure the oaks? How much shade can clematis tolerate? Any other ideas as to what would work well for this location? I'm in zone 4a.