Wood for posts to secure Fedge (Meathop LA11)

Hi Freegylers, I need around 6 pieces of wood to make posts to secure my living willow fence and arch. Just planted this year, so really wanting to secure it, before Storm Mary, or whatever name comes along. Any will do, I can make them into posts just need probably at least a couple of inches wide. Need 4 short ones for fence and 2 taller for arch. Thank you🙂