Plant types and subtypes: Perennials
Light Requirements: sun, part-sun, part-shade
Water Use: low
Soil Moisture: dry, moist
Soil Description: average, loam, clay, sand, gravel/rock
Bloom Time: June, July, August, September
Bloom Color: purple, lavender, blue
Leaf Color: green
Hardiness Zone: 2, 3, 4, 5, 6, 7
Additional Tags: attracts bees, attracts butterflies, attracts hummingbirds, clumping, cottage garden plant, cut flowers, deer resistant, drought tolerant, edible, fragrant plant, naturalizing, rock garden plant
Pricing & Availability
Agastache foeniculumAlso known as:
blue giant hyssop,
fragrant giant hyssop,
At 4' tall, Agastache foeniculum is one of the tallest of our native mints, and also one of the most ornamental. As with other members of the mint family, it has typically square stems. The leaves are ovate to broad-lanceolate with serrated margins, quite large (up to 4" long), and emit an aroma reminiscent of anise when crushed hence the common name anise hyssop. Beginning in mid-summer, it produces dense, cylindrical, bluish flower spikes that can be up to 6" long, and persist for up to 2 months.
Though not drought tolerant per se, blue giant hyssop performs better in dry conditions than most other members of the mint family. It is easy to grow, and well adapted to average well-drained soils. This species is tolerant of part-shade, but flower production is at its best when in full sun. Remove dead flower spikes to encourage new growth and extend bloom time. A very adaptable plant that can be used in rock gardens, as well as cottage gardens and perennial borders. It spreads by rhizomes to form dense colonies. Will also spread and naturalize by seed. A very hardy cool climate species. Zones 2-7
Very easy to propagate from seed or by division. The best time to separate clumps is early spring as new growth begins to emerge and is still low to the ground, or fall as plants enter dormancy.
The blue giant hyssop is well deserving of this common name because every aspect of this native member of the mint family is over sized. It is a good source of nectar and will attract bees, butterflies, and hummingbirds. Leaves can be used to make herbal teas, or dried and added to a pot pourri. Seeds can be used in baking as an alternative to poppy seeds.
Native Range & Classification
Recorded County Distribution: USDA data
CO, CT, DE, IA, IL, KY, MI, MN, MT, ND, NE, NH, NJ, NY, PA, SD, WA, WI, WY
USDA Endangered Status:
- Endangered: IA
|Species||Agastache foeniculum||blue giant hyssop|