Agastache nepetoides

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The neighborhood pollinators will be all in a buzz if you plant yellow giant hyssop in your garden.  Widely spaced palest yellow flowers open for many weeks on tall upright bold-leaves stems, drawing in lots of friends.  The candelabra seedheads that follow evolve from green to dark gray in late summer and fall, providing an architectural late-season garden feature.  This central and eastern U.S. native is a highly underrated ornamental.   3.5-inch pots.  Zone 4. 

Part shade to sun; moist humus-rich soil; 5'x2'; summer to fall

Photo: Tommy 

Winter photo: Elizabeth Axley