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Polemonium caeruleum

Jacob's ladder

Reader rating

From 7 ratings

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Key information

Plant type

Hardy perennial

Flower colour






Skill level


photo by Visions, copyright GAP Photos (61615)

Plant details

Jacob's ladder, Polemonium caeruleum is an easy perennial to grow and one of Pippa Greenwood's favourite choices for coping with rabbits in the garden. Not only do rabbits seem to leave it alone but it also an attractive plant for the border with moist but well-drained soil. It forms clumps of dark green leaves, and in early summer produces spikes of lavender-blue, bell-shaped flowers. To prolong flowering, deadhead regularly. Plants can be propagated by sowing seed in autumn or spring, or by dividing plants in spring.

Family: Polemoniaceae

Genus: Polemonium

Species: caeruleum

Plant type: Hardy perennial

Flower colour: Blue

Foliage colour: Dark green

Feature: Flowers

Sun exposure: Full sun, Partial shade

Soil: Well-drained/light, Clay/heavy, Moist

Hardiness: Hardy

Skill level: Beginner

Height: 75cm

Spread: 30cm

Time to plant seeds: September to May

Time to divide plants: March to May

Flowering period: June to June

Reader reviews


As well as being rabbit proof are also slug and snail proof but the flowers are edible for humans so great in salads and cake decoration.
I have flowers on the different plants from March to November, and the bees and pollinating insects love them.


Ive just bought one of these and planted it out today... I hope I am successful with it as I think its gorgeous!

Peter Hewitt

Polemonium are very prolific and they will seed all over the garden aqnd give you a lovely show, I only purchased one plant and have got hundred or more.


Very easy to grow from seed and you can pretty much leave it to its own devices all year, I get a lovely range of white and purple flowers from Mid May onwards.


It is not yet flowering but I'm looking forward to a splendid show.


I have one from a cutting I took a few weeks ago and to my surprise it took. It is now 12" high and in flower. will have to put it in the garden now and wait for other surprises.

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