Posted: 18/05/2015 at 22:49
Ernest Markham will cope with sun or semi shade so it can stay where it is but also be moved if you want to.
The main thing is to plant it good and deep and enrich its soil as clems are very hungry, thirsty plants. Planting it about 4" deeper than it was in its pot helps keeps the roots cool, which they like, but also encourages extra flowering shoots to form.
Ernest Markham is a group 2 which means just a light prune after flowering in May/June and then it will produce a main crop of flowers in late summer. It's often easier to treat it as a group 3 and prune it back hard in March. Either way it needs a generous feed of proper clematis food every spring and occasional waterings with rose or tomato fertiliser until it starts flowering.