Kendall County (IL) Forest Preserve District
Yellow Giant Hyssop
Agastache nepetoides [C-value 5]
Mint family (Lamiaceae)
Blooms
mid-July -
September
The native Yellow Giant Hyssop is uncommon in our area. It prefers light shade to partial sun and slightly moist fertile loamy soil. Habitats include deciduous woodlands, woodland borders, thickets and meadows in wooded areas. This perennial is 4-7' tall and little branched, except for a few stems from the mid to upper leaf axils. The central stem is 4-angled (square) and strongly winged. The toothed opposite leaves are up to 6" long and 3" across on petioles up to 2" long. The stems terminate in erect flower spikes 4-16" long and ¾–1" across with flowers densely crowded around the spike. Only a few flowers bloom at the same time. Each flower is about 1/3" long with a white (or pale greenish yellow) tubular corolla with 2 upper petals, 2 lateral petals, and a lower petal, and 4 strongly exerted stamens. This plant's stem branching and upright flower spikes give it an upside-down candelabra appearance.
Yellow Giant Hyssop along River Road August 8, 2017
Yellow Giant Hyssop at Baker Woods Forest Preserve August 14, 2012
Yellow Giant Hyssop at Maramech Forest Preserve August 14, 2013
Yellow Giant Hyssop at Millbrook South Forest Preserve August 28, 2013
Yellow Giant Hyssop fall seedheads at Jay Woods Forest Preserve November 3, 2014
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