Freezing does not discourage them at all!
Meticulously harvesting them is a pain though and might not be necessary unless you are going to eat them and/or intend to sow them in containers for later transplant. I just throw seed heads around in the fall and prop up giant stalks in the trees for birds to eat.
And in the spring they come up where ever--best germination is in full sun, well-drained soil, without a lot of competing vegetation. When I want to grow them in an area with an 'understory carpet of sorts' I just transplant seedlings that sprouted up wherever I didn't want them once they get tall enough to compete with the understory.
Oh--and the young leaves are pretty good. Have a salad or saute them when you thin all the volunteers out of your flowerbed
