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Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder) in full bloom — specialist nursery plant, Middleton Nurseries
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Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder)

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Plant information

  • Colour: Blue
  • Height: 40cm-50cm
  • Spread: 30cm-40cm
  • Soil: Can tolerate moderately poor soils, but avoid heavy clay that holds water
  • Position: Full Sun, Part Shade
  • Flowering Period: Summer to Autumn

Plant Description

Polemonium viscosum ‘Blue Whirl’ boasts striking green foliage and produces delicate light blue flowers that grace the plant throughout the summer. To stimulate additional blooming, it is recommended to deadhead the plant once the initial flowering phase concludes. This variety is hardy and is expected to withstand winter conditions with minimal protection, showcasing its resilience in colder climates.

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🌿 How to Care for Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder)

How much sun do Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder) need?
Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder) thrives in full sun—around six hours a day. While it can tolerate light shade, you’ll get the best flowering in bright, open spots.
Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder) prefers well-drained soil, ideally sandy or chalky. Rich or heavy soils can cause the plant to flop and reduce flower production.
Water well during the first growing season to help it establish. Once settled, Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder) is drought-tolerant and rarely needs extra water unless it’s extremely dry.
Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder) doesn’t require much at all. In fact, too much fertiliser—especially nitrogen—can lead to more leaves and fewer flowers. A light feed in spring is plenty, if needed.
Yes—regularly remove faded flowers from Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder) to encourage more blooms and stop self-seeding. You can cut the plant back in autumn or early spring to tidy it up and boost new growth.
Divide Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder) into clumps every 3 to 5 years in spring or autumn to keep them healthy and vigorous. You can also take soft cuttings in spring.
Yes, Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder)is drought handy. Once it’s established, it copes brilliantly in dry conditions, making it perfect for sunny borders and gravel gardens.
Polemonium Viscosum ‘Blue Whirl’ (Jacob’s ladder) is generally low-maintenance, but it can occasionally suffer from aphids or powdery mildew—especially in humid or overcrowded spots. Good airflow and spacing usually prevent problems.

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