Hello: I have some very high walls around my garden. Mostly they are nice red brick but one section is rough breeze blocks. It is about ten metres long. I planted three cotoneaster on it two years ago. These are growing very slowly but I think I will be happy with them in the end. I have realised they will never make it right the way to the top so this year I put three clematis in, in between the cotoneaster. I intend to train them straight up so that, hopefully, they can cover the top part of the wall quickly while the cotoneaster is still growing. Does this sound like a feasible plan? What should I train the clematis onto? I have honeysuckle on other walls and they are trained on lengths of reinforcing steel that are tied onto screws drilled into the wall. This works fine for them but I have read clematis are too fine for this. What would be a non-expensive (given the length of wall I have) way of supporting them? Thanks!