Polemonium caeruleum, commonly known as Jacob's ladder or Greek valerian, is a perennial flowering plant native to temperate regions of Europe and Asia. It features pinnate leaves resembling a ladder and clusters of bell-shaped blue or white flowers. It thrives in moist, well-drained soil and partial shade, blooming in late spring to early summer. Often used in gardens for its ornamental value and attractiveness to pollinators.

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