Polemonium – Jacob’s Ladder, Charity, Greek Valerian Jacob’s Ladder is a very ornamental and graceful flowering plant of early Spring and Summer. The flowers are blue, or white, flat or bellshaped, and are borne in spikes; the foliage is very finely cut, much resembling fern fronds. Polemonium caeruleum or the Greek Valerian is rather bushy with long spikes, about 2 […]