Polemonium caeruleum, known as Jacob's-ladder or Greek valerian, is a hardy perennial flowering plant. The plant produces cup-shaped, lavender-coloured or white flowers. It is native to temperate regions of Europe.
Polemonium caeruleum is a perennial flowering plant species from the family Polemoniaceae. Other plants in the family include annual Phlox and Cobaea scandens. Native to temperate regions of Europe and Asia where it is mainly seen growing in damp woodlands, grasslands, and meadows. The plant is commonly referred to as Jacob’s ladder due to the unique, somewhat ladder-like arrangement of its leaves. The pattern of leaf formation is called pinnate and is quite uncommon among flowering plants. However, the plant’s real attraction and the reason for its popularity are not the leaves or their unique arrangement, but its vibrant flowers. In addition to Jacob’s ladder, the plant is also known as Greek valerian, American great valerian, Charity plant, Ladder to heaven , and Make-bate.