Water
Keep the soil consistently moist, especially during the growing season. Water thoroughly when the top 2-3 cm of soil feels dry. Avoid waterlogging, as this can lead to root rot.
Reduce watering in winter when the plant is dormant.
Also known as Boreal Jacob's-Ladder
Northern Jacob's-ladder (Polemonium boreale) is a charming arctic-alpine perennial with clusters of striking blue, star-shaped flowers. Thrives in cool, moist environment
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun to Partial Shade
75% intensity
Thrives in full sun in cooler climates, but benefits from afternoon shade in hotter regions to prevent scorching.
Consistent Moisture
50% intensity
Prefers evenly moist soil, but allow top layer to dry slightly between waterings.
Moist, well-drained
50% intensity
Cold Hardy
25% intensity
Prefers cool to moderate temperatures. Tolerant of frost once established. Protect from extreme heat.
Light Feeding
25% intensity
Requires minimal feeding; a light application of balanced fertilizer in spring is sufficient.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
None
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Keep the soil consistently moist, especially during the growing season. Water thoroughly when the top 2-3 cm of soil feels dry. Avoid waterlogging, as this can lead to root rot.
Reduce watering in winter when the plant is dormant.
Deadhead spent flowers to encourage further blooming and prevent self-seeding if unwanted. In late autumn or early spring, cut back dead or faded foliage to maintain a tidy appearance and promote healthy new growth.
Remove any diseased or damaged parts promptly.
Propagate by division in early spring or autumn. Carefully separate clumps, ensuring each division has roots and shoots. Alternatively, sow fresh seeds outdoors in autumn or early spring.
Germination can be erratic, so patience is key. Cuttings can also be taken in late spring.
Repot young plants every 1-2 years in spring, or when they become root-bound. Mature plants can be left in situ longer, but divisions may require repotting more frequently.
Use a well-draining potting mix, and ensure the new pot offers adequate space for root expansion.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Northern Jacob's-Ladder (Polemonium boreale)
Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Ericales |
| Family | Polemoniaceae |
| Genus | Polemonium |
| Species | Polemonium boreale |
Similar in genus Polemonium
Answers based on plant encyclopedia data
