We are really beginning to think about risk management around the site now, so it was time to tackle a pile of glass still left in the remains of the greenhouse after it succumbed to a freak tornado,which swept down the hill, a few years ago. Removing the glass from the 20 metre radius of the greenhouse took me most of the next summer, but the glass in the greenhouse beds was swept in to a corner and quickly disappeared under a layer of weed. Nature conquers all, and in a few more years it would have become just another layer in the archaeological record of the garden. Time had already smoothed the sharp edges, which had made the job of tidying up so unpleasant the year it happened. But glass endures forever. Where will it eventually come to lie, and what will our descendants make of it in thousands of years from now?