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In the Grow - July 2002
Question and Answer
By: Beverly Shaw, Advanced Master Gardener- Purdue University

Q. I have tried and tried to identify this plant by searching in many wildflower, weed and herb books but can't identify it. Since I found it near my dad's woods beyond the cornfield, I do not know what color the dense spikes were, as we only go to the area after harvest, which is after frost.

I am sending an end seed piece, a piece of the stem and a sketch of the plant. Here are the clues for identification: it grows 6 feet tall, has a square stem and has 4-6-inch erect flower spikes.

The closest I've come to identifying it is Agastache nepetoides, but it doesn't get that tall, so that can't be it. -- Janice Teel, Mentone, Ind.

A. Good work! I often receive plant descriptions that are missing important bits of information, making it impossible to identify the plant. And you actually solved your own mystery, since the plant in question is, indeed, Agastache nepetoides or yellow giant hyssop. This is a perennial that can reach a height of 7 feet. (I'm guessing that you had a reference that said otherwise, but it really can!) The flowers are yellow-green, sometimes almost white, and appear from late summer into early fall. While this is most often found growing wild, it can be a nice addition to the back of the perennial garden, since it has an extended bloom time and some architectural interest.

Agastache is a member of the mint family, which is easily recognized by the square stem. Nepetoides means it looks like catnip (Nepeta). It is attractive to bees and butterflies and prefers thin woods, thickets and openings.


   

 

 

 

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