Polemonium caeruleum Blue Pearl seeds - Jacob's ladder
Polemonium caeruleum Blue Pearl seeds - Jacob's ladder
Polemonium caeruleum Blue Pearl
Jacob's Ladder, Greek Valerian
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Description
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.
Flowering
Foliage
Plant habit
Botanical data
Polemonium
caeruleum
Blue Pearl
Polemoniaceae
Jacob's Ladder, Greek Valerian
Polemonium caucasicum HORT.
Cultivar or hybrid
Planting and care
Polemonium caeruleum ‘Blue Pearl’ is best sown between February and April, under heated cover (15–20 °C), in fine seed compost, kept moist but not waterlogged. Germination usually takes 20 to 30 days.
Transplant young plants into pots when they are strong enough, then plant them in the garden after the last frosts, in May.
Sowing in situ is possible, but more delicate, as emergence is slow and seedlings are sensitive to competition.
Plant in rich, moist, well-drained soil, in partial shade or gentle sun. Space the young plants about 30 cm apart to allow them to form attractive clumps. Water regularly for the first few weeks to encourage rooting, especially in hot weather. An organic mulch can help maintain soil moisture. Remove faded flowers to encourage a second flush and limit self-seeding.
Divide clumps every 3 to 4 years in spring to aerate the crown and rejuvenate it. ‘Blue Pearl’ is not very susceptible to pests but may be prone to powdery mildew if the atmosphere is too humid or confined: good air circulation will limit this risk.
Sowing period
Intended location
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.