Growing the Elegant Shade Perennial Solomon's Seal

Branch of Solomon's Seal flowers.
Growing Solomon's Seal. Blue Magic Photography / Getty Images

Overview:

Solomon’s Seal (Polygonatum) is an elegant plant that is Native to North America. Although the dangling, white flowers and the black seed pods that follow are charming, it’s the arching stems and foliage that make Solomon’s Seal such a favorite in shade gardens and woodland settings. Once established, Solomon’s Seal slowly spreads out and creates a nodding blanket of foliage that turns a golden yellow in autumn.

The genus name biflorum refers to the fact that the flowers grow in pairs along the leaf axils.

Leaves: The slender, arching stems have alternating lance-shaped leaves that are either green or tipped with white.

Flowers: Small, tubular, white flowers dangle underneath the leaves. More mature plants tend to have more profuse flowers and are a bit showier. But it’s the plant form that makes Solomon’s Seal such an interesting plant. They are easy growers, but somewhat slow to become established. Another big plus - Solomon’s Seal is deer resistant.

Botanical Name:

Polygonatum

Common Name(s):

Solomon's Seal

USDA Hardiness Zones:

Solomon's Seal is reliably hard in  3 to 9.

Mature Size:

Size will vary among the different species and cultivars. Most Solomon's Seal plants grow to about 1 to 2 ft. tall (depending on variety.) The width of the plant is really only the 3 to 5-inch leaf span, but since the stem arches up and over, the width is more like 1 to 3 ft.

There is a Giant Solomon's Seal (Polygonatum. ​biflorum var. ​commutatum) that tops out at about 5 ft. tall and really makes a statement in the garden.

Exposure:

These really are woodland plants. Give your Solomon's a spot in partial shade. Solomon’s Seal can only take sun if the climate is cool and the soil is moist.

Bloom Period:

Solomon's Seal will bloom in mid-spring to early summer. The black seed pods persist into summer.

Design Tips:

Solomon’s Seal looks best when allowed to naturalize in a woodland setting. It pairs well with many shade garden plants, like Brunnera (Siberian Bugloss), Cranesbill Geranium, Dicentra (Bleeding Heart), Epimedium (Barrenwort), Ferns, Hellebore, Heuchera (Coral Bells) and Tiarella (Foamflower). These plants have attractive and often colorful foliage, providing season-long interest.

Suggested Varieties:

  • Polygonatum. biflorum - True Solomon’s Seal. Very dependable and one of the fastest growing.
  • Polygonatum. odoratum 'Variegatum' - Fragrant Solomon's Seal. Variegated form with white tips.
  • Polygonatum. biflorum var. commutatum - Giant Solomon’s Seal. Grows to about 5 ft. in height.

Growing Tips:

Plants are usually started by transplants or rhizomes. Seeds of Solomon’s Seal can take up to 2 years to sprout, so you will get some seeding in established plantings.

Solomon’s Seal like a rich organic soil with a soil pH in the acidic to neutral zone.

They need some shade to truly thrive. Damp shade is even better, although once established, they are quite drought tolerant. Plants can be started in the spring or fall. Plant only 1 - 2 inches deep and about 2 - 3 inches apart.

Maintenance:

Solomon’s Seal seldom needs division. It takes several years before a clump is large enough to divide for propagation purposes. When ready, divide in early spring or fall and leave several buds on each division, for the best success. The rhizomes can be divided even further, but it will take longer for them to become established. Another option is to remove and plant just the offsets at the out edges of a clump.

Solomon’s Seal does not require deadheading. The flowers are small and will drop off naturally. The foliage remains attractive all season, so the plant is virtually maintenance free. The stems even disconnect from the rhizomes on their own, after frost. But before that, the foliage turns a nice golden yellow in fall.

Pests & Problems:

Healthy Solomon’s Seal growing in good conditions seem to have few problems. If the weather is extremely damp, you may see signs of powdery mildew or another fungal disease. These should ameliorate as things dry out. Better air circulation will also help. Slugs and snails can also become a problem in damper areas.