Nodding Onion Gardens

Native Plant Nursery

Where Wildflowers Grow

Columbia Station, Ohio, USA


Agastache scrophulariaefolia - Purple Giant Hyssop

Ohio Native Plant - Natural Range

Agastache scrophulariaefolia

To view the natural range of Purple Giant Hyssop visit the USDA Natural Resources Conservation Service website.
A huge bee visiting Agastache scrophulariaefolia
Agastache scrophulariaefolia

Cultivation Information 

Agastache scrophulariaefolia

6 ft - 
Flower Color
- Purple - light purple not deep like Coneflowers
Blooms - July - October
Sun - Sun/Part Sun

Hardy Zone -

Family - Lamiaceae

A bee buzzing around Purple Giant Hyssop
This bee is so excited he can't stay in one place

Propagation Notes - Agastache scrophulariaefolia


Stratifying Seeds

Seeds placed in Cold Moist Storage   

Fall 2012 to Present - Seeds Collected at Nodding Onion Gardens 

Supplies Needed For Seed Stratification -

1. Zip lock plastic bag

2. Few table spoons of Vermiculite

3. Dampened vermiculite - not soggy

4. Store in refrigerator for 60 days

 Five flowers stalks of Purple Giant Hyssop that look like tall pillars
Purple Giant Hyssop

Wildlife Significance - Purple Giant Hyssop

Pollinator Specialist

The small sweat bee, Dufourea monardae relies on this specific plant for nourishment


By Bumblebees, honeybees and other long-tongues bees

Nectar For Butterflies 

Painted Lady, Red Admiral, Monarchs and sulphurs

Visited by

Humming birds and butterflies, Green Metallic bees and bee flies

DeerAvoid this plant

Xerces Societies -

Top 37 wildflowers that attract pollinators

For detailed information

Visit the Illinois Wildflower website

Purple Giant Hyssop next to beautiful pink Swamp Milkwee
Purple Giant Hyssop in the fall

Seed Provenance - Agastache scrophulariaefolia

Everwilde Farms, WI 2012 - Nodding Onion Gardens 2013 - present