Anise Hyssop

Plant of the Week September 5, 2022

Anise Hyssop (Agastache foeniculum)

By Timothy Newcomb, Anoka County Master Gardener

Anise hyssop is a perennial, native to the northern plains of North America. Its name is a misnomer since it is not related to either anise (Pimpinella anisum) or hyssop (Hyssopus officinalis) which are plants native to Eurasia. Anise hyssop is a member of the mint family and has very aromatic leaves that have a licorice flavor and smell. It is often used in tea or as an herb and has a long history of use in native medicine. 

It is clump-forming and spreads by both seed and underground rhizomes. It typically grows between 2-4 feet tall and 1-3 feet wide in medium to dry well-drained soil. It prefers full sun to part shade. As the plant gets more established, it is able to tolerate slightly drier soil. Blooms begin to appear in July and last for 6-8 weeks. The flowers attract many pollinators. The 3-6 inch tall flower spikes called verticillasters, or false whorls, vary in color from pale purple to lavender.

Caring for anise hyssop is easy once established. Selecting a proper site with good drainage and plenty of sunshine will prevent powdery mildew, rust, and root rot. Because of its strong scent, it is deer resistant.

Propagation occurs by splitting established plants in spring or fall or by growing from seed. The seeds need light to germinate so do not cover them with dirt. A cold moist stratification period will improve germination.

Anise hyssop is one of the best food sources for pollinators, and it is an excellent addition to any yard or pollinator garden. It has beautiful flowers and a lovely aroma that is sure to spice up any space. 

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