Polemonium, commonly known as Jacob's ladder, is a genus of herbaceous perennials or annuals that form bushy, spreading clumps. These plants have pinnate, deciduous leaves and produce clusters of tubular or bell-shaped flowers. They thrive in fertile, moist but well-drained soils and can be grown in full sun or partial shade, suitable for various garden aspects and exposures. Hardy to UK zone H7, Polemonium is ideal for cottage gardens, flower borders, and containers, offering interest through summer and autumn.

Jacob's ladder (Polemonium) is a hardy perennial with pinnate leaves and tubular flowers, ideal for summer and autumn in borders or containers.

Polemonium

Polemonium caeruleum, known as Jacob's-ladder or Greek valerian, is a hardy perennial flowering plant. The plant produces cup-shaped, blue or white flowers.

Polemonium caeruleum, or Jacob's-ladder, is a hardy perennial with blue or white cup-shaped flowers, ideal for borders, patios, and cottage gardens.

https://en.wikipedia.org/wiki/Polemonium_caeruleum

Polemonium caeruleum

Polemonium kiushianum is a species of Polemonium in the family Polemoniaceae, known within the Jacob's ladder group. It produces its main flowering display in the UK from May to July. The plant is valued for that seasonal display and is treated by gardeners as a flowering perennial. Gardeners often compare its habits and timing with other Polemonium species when planning beds.

Polemonium kiushianum flowers in the UK from May to July and belongs to the Polemoniaceae family.

Polemonium kiushianum

Jacob's Ladder (Polemonium kiushianum) | May–July Flowering

Polemonium yezoense 'Midnight Rain' is a herbaceous perennial cultivar of the Polemonium genus, known for its bushy, clump-forming, and spreading habit. Like other Polemonium species, it features pinnate leaves and produces clusters of tubular or bell-shaped flowers. This deciduous plant thrives in full sun or partial shade, favouring fertile, moist but well-drained soils across a range of types and pH levels. Hardy to UK zone H7, it is suitable for cottage gardens, flower borders, patios, and containers, offering interest throughout summer and autumn.

Polemonium yezoense 'Midnight Rain' is a hardy herbaceous perennial with pinnate leaves and summer to autumn blooms, ideal for borders and containers.