Karrie,
I personally don't deadhead mine *or her's* until
fall time...I tend to let mine just be on a regular schedule... no double blooms...
Only because I live here in
zone 5 and it's a short enough season, that by the time they bloom,
stay blooming for a week or more, and then start to die down, it's almost the end of the season...
and if I cut it down to promote a second growth and flowering, I run the risk of the
plant having new green~tender growth, late in the season,
when I really want it to be preparing it's self for nightie~night here for the winter...
To me, it weakens an already not allllllllll that
hardy type of a
plant...I mean it does good, under the right conditions, and then sometimes can fade..I've had gorgeous one's and then they've died or didn't come up the following
spring...
so, like I said for me, I just leave it....
But.....someone in a longer
growing season,
may very well be able to do this, the double flowering and have it fair well.
I know they re~
seed on their own too, my mom
had one do that... *I never did*