What is Polemonium caeruleum?

Polemonium Caeruleum

Jacob's Ladder or Greek valerian (Polemonium caeruleum) is a hardy perennial flowering plant. The plant produces cup-shaped, lavender-coloured or white flowers. It is native to temperate regions of Europe.

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Some articles on Polemonium caeruleum:

Polemonium Caeruleum - Uses - Other Uses
... Polemonium caeruleum was voted the County flower of Derbyshire in 2002 following a poll by the wild plant conservation charity Plantlife ...