Divide the rootball every 3-4 years carefully as roots are tender.
Will tolerate full sun only in climates with cool summers. Part shade is best.
Deadhead to prolong blooming throughout the season.
Contrary to the above information, my seed germinated in SIX days and my plants bloom in late spring and early summer.
Sow direct into the ground early spring or early summer. Self seeds freely.
Ensure a seed sowing distance of 7.02 inches (18.0 cm). Soil temperature should be kept higher than 19°C / 66°F to ensure good germination.By our calculations*, you should look at sowing Jacob's ladder about 56 days before your last frost date .
These estimates for how long Jacob's ladder takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Average 56 days | Min 33 days | Max 98 days (4)
Average 15 days | Min 15 days | Max 15 days (1)
Average 69 days | Min 69 days | Max 69 days (1)
Our when to plant Jacob's ladder estimates are relative to your last frost date.
The botanical epithet is from the Latin caerulea meaning “off whitein color”, “creamy” or “almost blue”.1
The ancient Greeks used this plant to treat dysentery, toothaches, and bites.
Greek valerian, Jacobs Ladder
Polemonium caeruleum L.