Correct me if I'm wrong, but I don't believe pulling (picking) mushrooms up, roots and all, is advisable. I think one needs to pinch them off at the base or cut them off leaving the root in place. You should be able to go back, year after year, to a place where you picked a morel and unless someone beat you to the 'shroom, you can pick there each year. Wild asparagus, too...sometimes you find it growing in the ditches...after it has whatever they call it, flowered out? So you mark the spot and go back in the spring when it is new growth.