Polemonium
Polemonium is a genus of flowering plants in the family Polemoniaceae, commonly grown as ornamental perennials. The group comprises about 25 species native to temperate regions of the Northern Hemisphere, especially North America and parts of Asia and Europe. The best-known species is Polemonium reptans, commonly called Jacob's ladder, which is prized for its delicate foliage and panicles of blue flowers.
Plants are herbaceous perennials with a clump-forming to creeping habit. Leaves are typically pinnate, with 3–11
Polemoniums prefer moist, well-drained soil and a site with partial shade or protection from afternoon sun
Propagation is by seed or division in spring or fall. Some species hybridize readily in cultivation, producing