I'm really shocked to see the size and age when you mentioned it. That one looks like a 4 month old Agastache which started from volunteers.

All my agastache are doing well. Full Sun, full shade, indirect, they're all healthy. I just leave them. I don't even water.

The seeds are pretty easy to harvest. Wait until the lavender flowers turn tan/brown later in the fall. The seeds are tiny & black and will pour out of the dried flower heads if they haven't fallen out already. I love that even the seeds smell like licorice.

My agastache had a great first year, second year it was pretty disappointing but it's gorgeous this year. I only planted it once so either it's hardy where I am or it reseeds itself. The first year after I planted it there were several dozen volunteers but I pulled them out. I didn't want a huge clump in that spot.

It's rare NOT to see a bee on them. I finally staked mine so I could walk by without disturbing the bees.

Here's a picture up close (pardon the weeds! :-)

{{gwi:424342}}

I'm curious if the two 'weeds' in the lower right corner are actually seedlings. I've decided not to weed the area until they get a little bigger so I can tell if they are.

The seedling's true leaves have a purple hue on the outer parts of the leaves. :)

It's been a bad year for agastache for me too. They are drought tolerant, but not nearly as tolerant as we've had to be this summer. Little rain, and I didn't pinch as much as I should have. So...mine look like yours or worse, sprawling all over. I do cut mine back each year after I harvest the seeds. They sometimes remain green through the winter, but usually die down. So I'd just chalk it up to a bad year and next spring, start pinching once the new growth is about 6" tall. Just snip off the top two leaves on each stalk and do that again after they're 12" and again at 18". Last year they were beautiful doing that.

Today my neighbor had her husband dig out the plants I gave her several years ago and load them on my truck. I brought them home and planted them in a couple of full sun spots around the garden. They don't look great but they were fighting thick weeds where she had them. Now they'll get their own dirt with no competition. I'll pinch them next year and see how they do. Sure hope we don't have a repeat of this summer next year.