Blue Glitter, Eryngium Seeds

Blue Glitter Sea Holly Seed

Blue thistle-like blooms offer exceptional fresh and dried texture
Long sturdy stems provide lasting vase life
Hardy plants tolerate hot sunny locations
Flowers attract bees and beneficial insects

See product details

Key Attributes

Botanical Name

Eryngium planum

Days to maturity

365 Days

Sun

Full Sun

Packet

10 Seeds

Zones 5–9 Check your growing zone

About Blue Glitter, Sea Holly Seed, Sea Holly Seed

A beautiful cut-flower that has long shelf life once cut. Can also be dried for beautiful floral arrangements. Eryngium is a hardy perennial with long, sturdy stems. Tolerates hot, sunny locations. Plants produce flowers during the second year of growth and in subsequent years. Attracts bees, beneficial flies and wasps. Also known as plains eryngo and flat sea holly.

Growing details

Planting

Sow Depth

1/8"

Days to Germination

14–28 days

Germination Type

C60 - Cold Moist 60 Days

In-row plant spacing

18-24"

Plant profile

Life Cycle

Perennial

Hardiness Zone

Zones 5-9

Plant Height

48 inches

Growth Habits

Clumping, Upright

Seed & variety

Seeds Per Ounce

19,986

Color

Blue

Seed Type

Open Pollinated

Before Planting

Give Sea Holly a full-sun site with well-drained soil and good air circulation. Remove perennial weeds, loosen compacted ground, and incorporate modest compost without making the bed overly rich. Prepare a fine, firm seedbed. Plan to cold-moist stratify seed for about 60 days before sowing.

Planting

Sow sea holly outdoors in fall or start indoors according to its germination requirement; many perennial species benefit from a cool period before warmth. Maintain even moisture during germination and provide bright light after emergence. Harden indoor-grown seedlings before planting outdoors. Transplant while young to minimize root disturbance, and thin direct sowings after sturdy true leaves develop.

Watering

Once established, sea holly prefers deep, infrequent watering. Let the surface dry between irrigations, supply extra moisture during extended heat, and avoid keeping the crown continuously wet.

Fertilizer

Fertilize sea holly modestly as new spring growth begins, following soil-test recommendations. Stop after midsummer so late tender growth does not reduce winter hardiness.

Harvesting

Sea Holly is ready for cutting when blooms are well colored and nearly open. Use clean shears and long stems. For seed, leave selected heads until dry, then collect before shattering.

Tips

Mulch sea holly after the ground cools in cold climates, keeping material away from the crown. Remove winter-damaged growth in spring and divide overcrowded plants as needed.

Pests & Diseases

Sea holly may suffer powdery mildew, leaf spots, and crown or root rot, particularly in heavy winter-wet soil. Keep mulch away from the crown and remove infected foliage after flowering. Transplant only healthy seedlings; a softened crown usually cannot be saved and indicates the site needs better drainage.

Sea Holly can attract aphids, thrips, spider mites, Japanese beetles, and slugs. Scout flowers and new growth regularly, handpick when practical, and protect beneficial insects with targeted controls.