If it is just blooming now, it will be a few weeks before seed fully develops. Depending where in zone 6 you are, it may be a native plant. It will spread both by reseeding itself (seeds may or may not need stratifying) and by rhizomes, so chances are, regardless of what you do, you should have more plants next year.

tj

'lily', any chance you could post some pictures of your MM?

(I just planted 3 of them this past week).

I never learned how to get pictures to this site...technoretard....sorry where did u get them that uv just planted them

I grew some from seed last winter. They came up easily but now that they're blooming I'm underwhelmed. They just don't look as showy as some others I saw for sale last year, the leaves don't seem as silver.
I can't say for sure what would work best for you, I had the seeds in paper towels in the fridge for a few weeks then planted them, you could just plant them as soon as the seed heads start to dry, or winter sow, or spring sow..... or just divide in spring, that's probably the easiest!
Here's mine. I don't have a bigger picture, this was more an attempt at a bug shot.

thanks to kato for the pics. yours is a different variety. I have P. muticum...flowers look almost like a dogwood bract. I agree the plant itself is not distinguished, but love the little flower. have so many empty spots that need filling I hope this will carve out a spot for itself. plus I've read its not the awful mint habit of taking over the world

I have P. muticum...I love the little flower. have so many empty spots that need filling I hope this will carve out a spot for itself.

That is the variety I planted recently. (I got them at a nearby small independent nursery). With not much space left I placed put them wherever hoping one or more of the 3 will catch on.

This post was edited by rouge21 on Fri, Aug 15, 14 at 12:20

I'll try and get a picture later this afternoon.

Yes, it does take over the world, or at least it tries.

As promised, Photograph of Pycnanthemum muticum

{{gwi:265239}}

I pulled out about half of it last year. So about everything past the rudbeckia is new. A big positive to having all of it this year, is this is the first time in ages the rudbeckia has bloomed. Usually the deer get to it at some point.