Ray, for this post, it might be good to add your botanical name. As you know there a couple different varieties.
Yes, it's has long rizomes. We used to plant starts with a broom stick. Picky about when its planted etc. It's of the few effective dune stabilizers so your experiment will be interesting.
I'm just "along for the ride", to see if the KelpMax offers any advantage. All I've been told is Uniola paniculata .