Until recent years, Iris bucharica (below) was a favored spring filler between paperbush (Edgeworthia chysantha) and a Fernspray cypress (Chamaecyparis obtusa ‘Filicoides aurea’). But, and there are arguably too many buts around this place, the paperbush grew much wider than expected to shade the irises. For once, I plead innocence. I am the victim of…