Agastache nepetoides (Yellow Giant Hyssop)

Plant Info
Also known as: Catnip Giant Hyssop
Genus:Agastache
Family:Lamiaceae (Mint)
Life cycle:perennial
Origin:native
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):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

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Detailed Information

Flower: Flower shape: irregular Flower shape: tubular Cluster type: spike

[photo of flowers] 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: Leaf attachment: alternate Leaf type: simple

[photo of leaves] 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.

[photo of stem] Stems are stout and strongly four-angled, heavily branched throughout, typically smooth but sometimes with minute soft hairs, especially on the the leaf stalk.

Notes:

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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More photos

Photos courtesy Peter M. Dziuk taken in a private garden in Ramsey County.

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: Scott - Driftless region,Root River Valley.
on: 2014-08-28 20:57:53

Populations of native yellow giant hyssop occur here in the Driftless region. I have pressed specimens and images readily produced. Habitat loss has taken three of the known populations,meeting purple giant hyssop which is infiltrating these once more open situations is perhaps their greatest threat..

Posted by: Debra - Milaca
on: 2015-06-23 10:00:44

Came up on south side of home, growing in rock.

Posted by: Joseph - Lyon county
on: 2015-08-29 14:47:05

I found Yellow Giant Hyssop in Camden State Park and along the Redwood River near my home just north of the City of Lynd.

Posted by: Janet - St Paul, Mac-Groveland neighborhood
on: 2015-09-01 13:54:58

It came up in my alley garden, which was already planted to natives. This garden is partly shaded. Yellow giant hyssop is taking over. Bumblebees and honeybees really like it.

Posted by: K. Chayka
on: 2015-09-01 13:56:05

Janet, it can produce copious amounts of seed. Dead-heading helps, and raking can clear out the seedlings. Whoever said native plant gardens don't require any maintenance never had one!

Posted by: Angie - Eden Prairie
on: 2017-08-02 10:47:10

Have a few of these in my native shade garden...I'm commenting though because it was difficult to identify them on your website. I eventually had to broaden my search to this very vague set of criteria to find it:
Criteria: type=flower; flower=yellow,irregular,spike;

You may want to look into the search setup for this species?

Posted by: K. Chayka
on: 2017-08-02 17:25:21

Angie, without knowing what your original failed search was, it's a bit difficult to figure out what might need adjusting.

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