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Agastache foeniculum

blue giant hyssop add to wishlist

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

Height: 2'-4'

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

Agastache foeniculum (blue giant hyssop)
  • Agastache foeniculum (blue giant hyssop)
  • Agastache foeniculum (blue giant hyssop)
  • Agastache foeniculum (blue giant hyssop)
  • Agastache foeniculum (blue giant hyssop)

Pricing & Availability

Description

Agastache foeniculum

Also known as:

blue giant hyssop

,

anise hyssop

,

fragrant giant hyssop

,

lavender hyssop

Scientific Synonyms:

Agastache anethiodora

Description

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.

Cultivation

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

Propagation

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.

Additional Notes

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

Native Range:
CO, CT, DE, IA, IL, KY, MI, MN, MT, ND, NE, NH, NJ, NY, PA, SD, WA, WI, WY

USDA Endangered Status:

  • Endangered: IA

Classification

Kingdom Plantae Plants
Subkingdom Tracheobionta Vascular plants
Superdivision Spermatophyta Seed plants
Division Magnoliophyta Flowering plants
Class Magnoliopsida Dicotyledons
Subclass Asteridae
Order Lamiales
Family Lamiaceae Mint family
Genus Agastache giant hyssop
Species Agastache foeniculum blue giant hyssop