Polemonium reptans is a perennial herbaceous plant native to eastern North America. Common names include spreading Jacob’s ladder, creeping Jacob’s ladder, false Jacob’s ladder, abscess root, American Greek valerian, blue bells, stairway to heaven, and sweatroot. It is an interesting perennial plant known for its ladder-like arrangement of leaves and delicate, often blue or purple flowers.
Characteristics
- Foliage: Jacob’s Ladder has distinctive, ladder-like leaves that are compound and pinnate, giving the plant its common name. Each leaf consists of several pairs of leaflets, which are sometimes accented with white or silver markings.
- Flowers: The flowers are typically bell or funnel-shaped, growing in loose clusters at the top of the stems. They come in various shades of blue, purple, pink, and white, with blue being the most common. The blooms have a slight fragrance.
- Bloom Time: Depending on the species, flowering can occur from late spring to mid-summer.
- Height: Plants can range from 1 to 3 feet in height, with some cultivated varieties being more compact or taller.
- Spread: They tend to form clumps and can spread over time through rhizomes or by self-seeding.
- Hardiness: Many species are hardy in USDA zones 3 through 7, though this can vary by species.
Cultivation
- Light: Jacob’s Ladder prefers partial shade to full sun. In hotter climates, some afternoon shade is beneficial to prevent leaf scorch.
- Soil: It thrives in well-drained, fertile soil rich in organic matter. The soil pH should be neutral to slightly acidic. Good drainage is essential to prevent root rot.
- Water: Regular watering is needed to keep the soil consistently moist but not soggy. Once established, the plant is somewhat drought-tolerant but will perform best with regular moisture.
- Planting: Spring or fall is the best time for planting. Space plants about 12 to 18 inches apart to allow for their natural spread.
- Propagation:
- Division: Divide clumps in early spring or late fall. This not only helps to propagate but also rejuvenates older plants.
- Seeds: Sow seeds outdoors in the fall if you’re looking to replicate the natural stratification process, or start indoors 6-8 weeks before the last frost date for spring planting.
- Maintenance:
- Pruning: Deadheading spent flowers can encourage further blooming. After the bloom period, some gardeners cut back the plant to promote new, lush growth.
- Mulching: Mulch around the base to help retain moisture and control weeds, but be careful not to cover the crown of the plant.
- Pests and Diseases: Generally, Jacob’s Ladder is not particularly susceptible to pests or diseases. However, watch out for slugs and snails, which might damage the foliage. Powdery mildew can be an issue if air circulation is poor or if plants are too wet.
- Fertilizing: A light application of a balanced, slow-release fertilizer in the spring should suffice. Over-fertilizing can lead to lush foliage at the expense of flowers.
- Winter Care: In colder climates, mulch around the plant in late fall to protect the roots from freezing temperatures.