thanks
there were 5-6planks burried on some compost waste, hence the black dirt on the wood.- first pic.

actually i collected the bottom pic, 2pcs first, cos i suspect something nice underneath the dirt, and sure enough after planed.. they look so good.

went back to collect the rest few days ago. dirty also nevermind, scrape the loose dirt and throw in car first 
going to plane the rest of boards and see how they look. will update later.