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Common Jacob’s Ladder

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Common Jacob’s Ladder has masses of beautiful spikes of blue flowers rising above the foliage from mid spring to mid summer, which are most effective when planted in groupings. The flowers are excellent for cutting. Its ferny pinnately compound leaves remain green in color throughout the season.

Characteristics

Species:
caeruleum
Average Landscape Height:
12 inches (24 inches with the flowers)
Average Landscape Width:
18 inches
Genus:
Polemonium
Branching:
herbaceous
Plant Form:
over mound
Canopy:
closed
Growth Rate:
medium
Pruning:
spring cleanup
Spacing:
15 inches
Flower Color:
blue
Flower Period:
from mid spring to mid summer
Summer Foliage Color:
green
Maximum Light:
full sun
Minimum Light:
partial shade
Maximum Moisture:
moist
Minimum Moisture:
average
Pollution Tolerance:
medium

Ornamental Features

Common Jacob's Ladder has masses of beautiful spikes of blue flowers rising above the foliage from mid spring to mid summer, which are most effective when planted in groupings. The flowers are excellent for cutting. Its ferny pinnately compound leaves remain green in color throughout the season.

Landscape Attributes

Common Jacob's Ladder is an herbaceous perennial with tall flower stalks held atop a low mound of foliage. Its relatively fine texture sets it apart from other garden plants with less refined foliage.

Planting & Growing

Common Jacob's Ladder will grow to be about 12 inches tall at maturity extending to 24 inches tall with the flowers, with a spread of 18 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 15 inches apart. Its foliage tends to remain dense right to the ground, not requiring facer plants in front. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 10 years. As an herbaceous perennial, this plant will usually die back to the crown each winter, and will regrow from the base each spring. Be careful not to disturb the crown in late winter when it may not be readily seen!

This plant does best in full sun to partial shade. It does best in average to evenly moist conditions, but will not tolerate standing water. It is not particular as to soil type or pH. It is somewhat tolerant of urban pollution. This species is not originally from North America. It can be propagated by division.

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