Blue Giant-hyssop
Agastache foeniculum
Last reviewed: June 2026
Light
full sun
Water
medium
Size
24"–48" H × 18"–24" W
Bloom
Jun, Jul, Aug, Sep
Native to
CO, IA, ID, IL and 9 more states
Pollinators
bees, butterflies, hummingbirds
Blue giant-hyssop is an upright perennial herb with fragrant, mint-scented foliage and dense spikes of small blue to purple flowers. It blooms continuously from June through September, creating an attractive vertical accent in sunny gardens. This native plant forms neat clumps and has a tidy, structured appearance that works well in formal landscapes.
In an HOA neighborhood
Blue Giant-hyssop is an HOA-friendly choice. Maintenance level: low. Tidiness: 4 out of 5.
Works well in: front yard, foundation, street edge, mid zone.
- May self-seed if not deadheaded
Wildlife value
Excellent pollinator magnet that attracts bees, butterflies, and hummingbirds throughout its long blooming season. The seeds also provide food for goldfinches and other small birds in fall.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does Blue Giant-hyssop fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.