Greek valerian is a common name for several plants and may refer to:

A person who is growing Greek valerian in a container or home garden should protect the plants if they own a cat.)

Polemonium caeruleum, known as Jacob's-ladder or Greek valerian, is a hardy perennial flowering plant.

Common names include abscess root, creeping Jacob's ladder, spreading Jacob's ladder, false Jacob's ladder, american Greek valerian, blue bells, stairway to heaven, and sweatroot.

This species is similar to Polemonium caeruleum and P. reptans.

One rare species, Jacob's-ladder (Polemonium caeruleum), is associated with this community.

Polemonium caeruleum, known as Jacob's-ladder or Greek valerian, is a hardy perennial flowering plant.

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

Putting the right name to the right plant is crucial, whether the name is a poetic yet common one like ladders-to-heaven, or its scientific equivalent, Polemonium caeruleum.

As part of a County flowers of the United Kingdom, the plant conservation charity Plantlife chose the Polemonium caeruleum as the county flower.

I admire Jacob's ladder (Polemonium caeruleum) more for its glossy, fern-like leaves now than I did for its sprays of blue flowers in June.

The Monyash end of Lathkill Dale is well known for the flower Jacob's ladder (Polemonium caeruleum), which is common in gardens but rare in the wild.

The perennials are listed in their order of bloom in my garden in Princeton, N.J. For April, there is Jacob's ladder (Polemonium caeruleum).

Hach. Polemonium L. Polemonium caeruleum L. Polemonium reptans L. Polemonium yezoense (Miyabe & Kudô) Kitam.