Species

Agastache rugosaKorean mint

2 other cultivars

perennial

Heronswood Mist Hyssop

Agastache rugosa 'Heronswood Mist'

The Story

Plant Bio

A hardy perennial known for its aromatic foliage and long-lasting flowers.

Heronswood Mist is valued for its unique silvery foliage that enhances its visual appeal.

Uses & Benefits:

Agastache rugosa Heronswood Mist offers aromatic foliage and vibrant lavender flowers, perfect for attracting pollinators and adding fragrance to garden beds.

Its drought tolerance makes it ideal for low-water gardens and xeriscaping, reducing maintenance and water bills.

Attracts bees, butterflies, and hummingbirds, supporting local pollinator populations.

SpeciesAgastache rugosaKorean mint

Essentials

At a Glance

Plant Type

Perennial

Height

27 inches

Width

18 inches

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8, 9

Water

Moderate, drought-tolerant once established

Humidity

Prefers dry to moderate humidity

Lifespan

Perennial

Native To

East Asia

Toxicity

Non-toxic to humans and pets

Planting

How to Grow

Tuck seeds into well-draining soil in early spring for best germination.
Mist cuttings regularly to maintain humidity and promote root growth.
Transplant seedlings when they are sturdy, about 6 weeks after germination.
Fertilize with a balanced, organic fertilizer every 4–6 weeks during the growing season.
Prune back after blooming to encourage bushy growth and more flowers.
Mulch around plants to retain moisture and suppress weeds.

Pro Tip

Plant in full sun with well-draining soil for vigorous growth and abundant flowers.

Keep It Thriving

Care Guide

Do

Water deeply once a week during dry spells 🌱
Prune spent flower stalks to encourage rebloom
Apply organic compost annually for healthy growth
Provide good air circulation to prevent disease
Mulch to retain moisture and suppress weeds

Don't

Avoid overwatering to prevent root rot ❌
Do not fertilize with high nitrogen in late summer
Skip heavy pruning in late fall to protect winter buds
Don’t plant in poorly drained soil
Avoid excessive shade which reduces flowering

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Prune
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Herbaceous border with aromatic foliageDrought-tolerant perennial for sunny bedsFragrant hedge along pathways

Companion Plants

Echinacea SedumLavender Salvia Gaillardia

Multiply

Propagation Methods

Good to Know

Common Questions

Heronswood Mist Hyssop questions

What zones can Heronswood Mist Hyssop grow in?

Heronswood Mist Hyssop is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Heronswood Mist Hyssop deer resistant?

Yes — Heronswood Mist Hyssop is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Heronswood Mist Hyssop bloom?

Heronswood Mist Hyssop typically blooms in mid-summer to early fall through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Heronswood Mist Hyssop need full sun?

Heronswood Mist Hyssop does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Heronswood Mist Hyssop drought tolerant?

Yes — once established (usually after the first full season), Heronswood Mist Hyssop handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.