The Clematis is by far the most popular of all the climbers. They are native mostly to the northern hemisphere and are considered to be twiner climbers. Clematis like to have their top growth in full sun but their roots in the shade. Roots can be shaded with plantings of groundcover plants or with other low-growing subjects, with paving slabs or with even a deep mulch of organic matter. Clematis grow well in any well-drained, reasonably rich soil containing plenty of humus. They are particularly suitable for chalky soils. Keep the plants permanently mulched with organic matter.