You can dig and divide these but they take some muscle. I would wait until spring to do that.
Some companies sell seed for these, but like many perennials, it can be a year before you see a bloom from the seed. I would suggest you take some of the spent blooms and plant your own seeds. The babies look like new grass and are easy to mistake for weeds. (yep, I pulled ALL my seedlings..)
Some of the newer varieties are super cool! The popsicle series is one I really love.
Here's Monrovia's page on them:
http://www.monrovia.com/?s=pop...
