Agastache foeniculum(Pursh) Kuntze

blue giant hyssoplavender giant-hyssop

WFO wfo-0000902466 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Agastache foeniculum, photographed by Michelle Orcutt
fig. a Michelle Orcutt, CC BY 4.0 / 2021-09-12 / obs. 157116067
Agastache foeniculum, photographed by Mary Krieger
fig. b Mary Krieger, CC BY 4.0 / obs. 157761708
Agastache foeniculum, photographed by Mary Krieger
fig. c Mary Krieger, CC BY 4.0 / obs. 157708324
Agastache foeniculum, photographed by Mary Krieger
fig. d Mary Krieger, CC BY 4.0 / obs. 154049434
Agastache foeniculum, photographed by Mary Krieger
fig. e Mary Krieger, CC BY 4.0 / obs. 153656313
Agastache foeniculum, photographed by Jason Swanson
fig. f Jason Swanson, CC0 1.0 / obs. 141313131
Agastache foeniculum, photographed by Shaan Aroeste
fig. g Shaan Aroeste, CC BY 4.0 / obs. 136942199
Agastache foeniculum, photographed by Mary Krieger
fig. h Mary Krieger, CC BY 4.0 / obs. 134796532

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 20 botanical countries

Regions where Agastache foeniculum is native: Alberta, British Columbia, Colorado, Idaho, Illinois, Iowa, Manitoba, Minnesota, Montana, Nebraska, New Brunswick, North Dakota, Northwest Territories, Ontario, Québec, Saskatchewan, South Dakota, Washington, Wisconsin, Wyoming AlbertaBritish ColumbiaColoradoIdahoIllinoisIowaManitobaMinnesotaMontanaNebraskaNew BrunswickNorth DakotaNorthwest TerritoriesOntarioQuébecSaskatchewanSouth DakotaWashingtonWisconsinWyoming
Native distribution of Agastache foeniculum, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
Alberta ABT NORTHERN AMERICA
British Columbia BRC
Colorado COL
Idaho IDA
Illinois ILL
Iowa IOW
Manitoba MAN
Minnesota MIN
Montana MNT
Nebraska NEB
New Brunswick NBR
North Dakota NDA
Northwest Territories NWT
Ontario ONT
Québec QUE
Saskatchewan SAS
South Dakota SDA
Washington WAS
Wisconsin WIS
Wyoming WYO

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Flowering 738 in flower of 843 examined

Peak flowering in Jul. Each bar is the share of Agastache foeniculum observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 738 of 843 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 5 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Also published as 20 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Agastache anethiodora (Nutt.) Britton & A.Br.
  • Agastache foeniculum f. bernardii B.Boivin
  • Agastache foeniculum f. candicans B.Boivin
  • Hyptis marathrosma (Spreng.) Benth.
  • Hyssopus anethiodorus Nutt.
  • Hyssopus anisatus Nutt.
  • Hyssopus discolor Desf.
  • Hyssopus foeniculum (Pursh) Spreng.
  • Lophanthus anisatus (Nutt.) Benth.
  • Lophanthus foeniculum (Pursh) E.Mey.
  • Perilla marathrosma Spreng.
  • Stachys foeniculum Pursh
  • Vleckia albescens Raf.
  • Vleckia anethiodora (Nutt.) Greene
  • Vleckia anisata (Nutt.) Raf.
  • Vleckia bracteata Raf.
  • Vleckia bracteosa Raf.
  • Vleckia discolor Raf.
  • Vleckia foeniculum (Pursh) MacMill.
  • Vleckia incarnata Raf.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.