Hi may sound like a stupid question but i thought best to ask before getting a load and putting it down, I've found a tree surgeon in my local area who will give me a load of wood chippings/bark to cover the large space i have cleaned at the back of the garden, there's no grass and i have put weed mat down due to it having alot of problems with weeds as a preventing method and bark seemed best to put on top as they love the stuff i buy in the pet store but its rather expensive, but what type of woods best and what should i avoid using? He has many different types available but wanted to make sure there wasn't any i should stay clear of, thank you
