Finding suitable low-growing plants for shaded, wet rockery gardens in cool climates

Gardeners in northwest England struggle to find and identify low ground cover plants that thrive in the specific conditions of their rockeries—typically shaded, poorly drained, and cold. Existing gardening resources are either too generic (recommending plants unsuitable for northern climates) or require expensive trial-and-error purchases that fail to establish. Gardeners waste money on plants that don't survive local conditions and spend months researching regional plant compatibility.