GENERAL INFORMATION
Scientific Name: Polemonium pulcherrimum
CommonName: Jacob's Ladder
Hardiness Zone: 5b - 9a
Hardiness Degree: -15°F (-15°C)
Blooming Season: Late Spring, Summer
Plant Habit: Mounded
Characteristics: Attracts Bees, Deer Resistant, Colorful/Attractive Foliage, Shade Tolerant
Water: Medium
Fertilizer: Once a month
Spacing: 10 - 13" (25 - 33cm)
Height: 6 - 8" (15 - 20cm)
Width: 12 - 14" (30 - 36cm)
Exposure: Partial Sun
PROPAGATION
Media EC/pH: EC 0.75-0.80 mmhos/pH 5.8-6.2
Soil Temperature: 68-72°F (21-22°C)
Rooting Hormone: None
Mist: Low mist or tenting
Fertilization: Balanced fertilizer 50-75 ppm once rooted to the bottom
Pinching: None
Transplanting: 7-8 weeks after sticking
FINISHING
Media pH: 5.8-6.2
Temperature: Nights: 50 to 55°F (10 to 13°C) Days: 60 to 65°F (16 to 18°C)
Light Level (fc): 1,500 to 2,500
Vernalization: Yes
Daylength: Day length neutral
Watering: Allow media to dry slightly between watering.
Fertilization: Use a balanced fertilizer at a rate of 100 to 125 ppm.
Pinch After Transplant: None
Plant Growth Regulators: PGRs generally not needed
Pests and Fungal Diseases: Pythium and rhizoctonia can result from overwatering.
CROP SCHEDULING
1–qt. (10–cm) pot, 1 plant per pot: 6-8 wks
1–gal. (15–cm) pot, 1 plant per pot: 10-12 wks
2 to 3–gal. (25 to 30–cm) pot, 3 plants per pot: 12-14 wks
Bloom Months: April to June