Paniculata is a good, hearty Hydrangea so you should have good success with it. There are quite a few cultivars of it so who knows which one you'll get from your seeds. And by the way, if your seeds are fertile they should germinate in a matter of a few weeks, not the several months I mentioned above. If you have access to adult plants you may have quicker success, and just as much fun, taking some cuttings and rooting them...rooting hydrangea is about the closest I can come to describing "instant gratification in the world of plant propagation".
Welcome to the site, Grayc. Hope to see you around!
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