Blue Hyssop Seeds | 250 Seeds

Introduction

Blue Hyssop (Agastache foeniculum) is a hardy, aromatic perennial known for its tall spikes of blue to violet flowers and anise-scented foliage. Blooming from early summer through fall, this native plant is highly attractive to bees, butterflies, and hummingbirds. Valued for its drought tolerance, long flowering season, and herbal uses, Blue Hyssop is ideal for borders, pollinator gardens, herb gardens, and naturalized plantings.

How to Grow Blue Hyssop Seeds

Start Blue Hyssop seeds indoors 6–8 weeks before your last frost date, or direct sow outdoors in early spring or fall.

Use a well-draining seed-starting mix.

Sow seeds on the soil surface and lightly press them in; do not cover deeply, as seeds require light to germinate.

Keep soil evenly moist during germination.

Maintain temperatures between 65–70°F for optimal germination.

Seeds typically germinate within 7–21 days.

Once seedlings emerge, provide bright light and good air circulation.

Transplant seedlings when they have 2–3 true leaves.

Harden off plants before planting outdoors.

Space plants 12–18 inches apart in full sun.

How to Care for Blue Hyssop Plants

Water regularly during establishment; mature plants are drought tolerant.

Grow plants in average to poor, well-drained soil; avoid heavy or wet soils.

Do not overfertilize, as excess nutrients reduce flowering and fragrance.

Blue Hyssop thrives in full sun and tolerates heat and cold.

Deadhead spent blooms to encourage continuous flowering.

Cut plants back in late fall or early spring.

Mulch lightly to suppress weeds while keeping soil well drained.

Plants are generally pest and disease resistant.

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