Hi Mysterio, welcome to the site, I've also just got my lottie and hadn't thought of the seaweed thing, I live 5 minutes walk from the beach. I've had a quick google and there seems to be a lot of talk of using calcified seaweed and liquid seaweed but nothing I've found seems to suggest putting it direct on the plot, although there was one suggestion of adding it to the compost heap. But..... I'm no expert so someone else on here with more knowledge may be able to say otherwise. Enjoy your lottie! ;D