I don't see how you can ID that plant from the picture. It looks like many of the Mentha species, but could be something else. Just considering Mentha, though, you would have to know if the flowers are clustered in leaf axils, or whether they are mostly or entirely in racemes at stem tips. You would also have to know if the calyx tubes and lobes are glabrous, the length of leaf-like bracts subtending flower clusters, petiole length, whether stems and leaves are glabrous, aroma when plant is crushed, etc. to distinguish.

Looks like quince to me as well. We have a large tree in our yard that I used to think was an apple tree. Now I'm thinking its a quince! It is about 15 feet high. Last year it produced a good amount of fruit that was eaten by the deer, crows and squirrels. They left me a single fruit that was as large as a grapefruit. It wasn't quite as sweet as an apple but it was still tasty. Here are two links that may answer some of your other questions. Links that might be useful: http://deliciousdays.blog.com/2012/04/09/learn-about-the-characteristics-and-uses-of-quince-fruit/ http://www.gardeningblog.net/how-to-grow/quinces/

Well, I feel silly, as soon as I posted this question, I found my answer online. Turns out it's most likely nepeta mussinii, a type of catmint. Still, a really neat plant

Thanks jeremyjs and especially glib. For your generosity and time, if either of you want some, I can spare a few roots. They are not mine, but I can ask nicely for some. Email me and I'll provide my address. I think $2 should cover the padded envelops and shipment. Thank you so much!!