Description : Polemonium - Greek Ladder, Jacob's Ladder (Polemo'nium)
Last Answer : DESCRIPTION: This group of perennials and annuals are mostly natives to North America. They grow 1 to 2 feet in height and produce pretty flowers during the spring and summer. P. caeruleum, Jacob's ... pauciflorum (needs a fairly mild climate outdoors); P. Richardsonii & var. pulchellum; P. flavum.