Polemonium caeruleum Blue Pearl seeds - Jacob's ladder

Polemonium caeruleum 'Blue Pearl' is a compact variety of Jacob's Ladder, also known as Greek Valerian, remarkable for its azure blue spring flowering. This bushy perennial has charming, finely divided foliage, similar to that of ferns. In borders, naturalistic gardens, or partially shaded areas, it appreciates moist, well-drained soil. This soft, poetic blue polemonium is robust, easy to grow and undemanding.

Polemonium caeruleum 'Blue Pearl' belongs to the Polemoniaceae family. Native to temperate regions of Europe and Asia, the species is naturally found in damp meadows, forest edges and mountainous areas.
The 'Blue Pearl' cultivar was selected for its abundant flowering and reduced size. This plant reaches a height of 30 to 60 cm and spreads 30 to 45 cm wide. It has a bushy and supple habit. The growth is moderate and flowering generally occurs from the second year after sowing. The upright stems bear clusters of campanulate azure blue flowers at their tips, measuring about 2.5 cm in diameter, with a light centre and yellow anthers. The flowering extends from May to June, sometimes until July, depending on the climate. The foliage is deciduous; it disappears in winter and re-emerges from the ground the following spring. It is compound with alternate, pinnate leaves, with bright green, oblong leaflets.
Polemonium 'Blue Pearl' is hardy down to -20°c but does not tolerate periods of prolonged drought or intense summer heat. The plant can self-seed spontaneously and is easily divided in spring.

The blue polemonium 'Blue Pearl' proves to be an excellent perennial for the damp, natural corners of the garden. More compact than the 'Lambrook Mauve’ variety, it fits well in the front or heart of beds, at the foot of old-fashioned roses or on the edge of light woodland. Perfect in mixed borders or in naturalistic garden scenes, it harmonises beautifully with mid-spring to early summer blooms like late tulips, columbines or foxgloves. Its soft blue pairs particularly well with silver or bronze foliage, or with orange blooms like Geum ‘Totally Tangerine’. Placed in borders, in cool rockeries, or even in partially shaded containers, it adds a light and poetic touch thanks to its airy foliage and luminous flowering.