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Jacob's ladder    

Polemonium caeruleum

Belonging to the Polemonium genus, Jacob's ladder has a botanical name of Polemonium caeruleum. Blooms appear in these approximate colours:   Blue-violet and   White, and typically produces a very strong grape kool-aid like fragrance. The mature flowers are of a single form. Leaves appear approximately as a   Celadon Green colour. It is a flower / herb that typically grows as a perennial, which is defined as a plant that matures and completes its lifecycle over the course of three years or more. Normally growing to a mature height of 70.0 cm (2.27 feet), Jacob's ladder grows with a erect habit. This plant tends to bloom in mid summer. This plant is a great attractor for bees, so if you are looking to attract wildlife Jacob's ladder is a great choice.

Due to how easy it is to grow in a variety of conditions, Jacob's ladder is great for beginner gardeners and those that like low maintainance gardens.

This plant info is provided by the myfolia gardener's wiki. All details about Jacob's ladder have been kindly provided by our members.

How to grow Jacob's ladder

  • Dappled Sun

    OR +
  • Partial Sun

    +
  • High

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.

Try to plant in a location that enjoys dappled sun / partial sun and remember to water often. Use Zone 3 - Zone 7 as your guideline for the appropriate climate for this plant. A soil ph of between 5.5 and 7.5 is ideal for Jacob's ladder as it does best in weakly acidic soil - weakly alkaline soil. Keep in mind when planting that Jacob's ladder is thought of as hardy, so it can be safe to leave outdoors for the majority of winter (although if in doubt, using a row cover is often a good idea).

Growing Jacob's ladder from seed

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 .

Transplanting Jacob's ladder

As Jacob's ladder is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.

Companion plants for Jacob's ladder

These plants have been known to grow well alongside Jacob's ladder so consider planting:

Repellent plants for Jacob's ladder

These plants will not grow well with Jacob's ladder so avoid planting these within close proximity:

Common Jacob's ladder problems

These problems, diseases and pests are known to affect Jacob's ladder plants:

Jacob's ladder Etymology

The botanical epithet is from the Latin caerulea meaning “off whitein color”, “creamy” or “almost blue”.1

Jacob's ladder Folklore & Trivia

The ancient Greeks used this plant to treat dysentery, toothaches, and bites.

Other names for Jacob's ladder

Greek valerian, Jacobs Ladder

Polemonium caeruleum L.

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Jacob's ladder care instructions

How long does Jacob's ladder take to grow?

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. Start logging and journaling your observations to participate!

When should I plant Jacob's ladder?

Our when to plant Jacob's ladder estimates are relative to your last frost date. Enter your frost dates and we'll calculate your sowing and planting dates for you!

Footnotes

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