In zone 5, what would be good perennials to plant along the top of of a west-facing low wall, moderate sunlight? I'd like the plants to trail down the wall's face.
Thanks for writing. Many varieties of bellflower (Campanula) are good trailers, especially ones like Campanula poscharskyana 'Blue Waterfall'. Some varieties of creeping dianthus and veronica also make good trailers, as can creeping thyme.