Hello! I moved the old garden bed left here by the last owners and thought I had an overgrowth of fernleaf dill. Someone pointed out that it's poison hemlock. It's in about a 1/4 of the yard, under the deck etc. What is the best way to get rid of this? There's too much to pull out. Also is the soil safe to use for new crops? I've read for people to not compost them and have read that composting is safe because the poison breaks down quickly etc. If there's a small piece hidden somewhere will it affect things I plant in the bed? I have young kiddos I've been keeping out of that area. Thanks!