Agastache nepetoides (Yellow Giant Hyssop)
|Also known as:||Catnip Giant Hyssop|
|Habitat:||part shade, sun; moist open woods, thickets, woodland edges|
|Bloom season:||July - October|
|Plant height:||3 to 5 feet|
|Wetland Indicator Status:||GP: FACU MW: FACU NCNE: FACU|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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A dense, narrow, 2 to 8 inch spike of pale greenish to yellow flowers at ends of stems and branches, often with several separated flowers at the spike base and only scattered flowers open at any one time. Flowers are tubular, about 1/3 inch long with four irregular lobes: a broad fringed lower lip, two small lateral lobes and smaller fringed upper hood. 4 slender stamens and single style, forked at the tip, extend conspicuously from the floral tube.
Leaves and stems:
Leaves are thin, generally egg-shaped, rounded to nearly heart-shaped at the base, pointed at the tip, with coarsely toothed edges and fine hairs on the lower surface. Lower leaves are up to 6 inches long including a 2 inch stalk, to 3 inches wide; the upper leaves are smaller.
Yellow Giant Hyssop is a southern species of open woodlands and thickets. While Minnesota is the northwestern edge of its range, the two documented occurrences are from the Lac Qui Parle river bottoms in Chippewa and Lac Qui Parle counties in west central MN. Presently listed as a “tracked” species by MN-DNR, in all likelihood there are other locations out there pending some botany enthusiast with an open mind and open eyes, spotting it.
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Photos courtesy Peter M. Dziuk taken in a private garden in Ramsey County.
Have you seen this plant in Minnesota, or have any other comments about it?