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|Noun||1.||giant hyssop - any of a number of aromatic plants of the genus Agastache|
herb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
Agastache nepetoides, yellow giant hyssop - erect perennial with stout stems and yellow-green flowers; southern Canada and southeastern United States