Good thing about plants- if they aren't growing where you want them you can dig them up in spring or autumn and plant them where you do. This clump of Stinking Iris (Iris foetidissima) has been developing over the past few years among some not very productive Raspberry canes on the allotment. 

 I used to mulch the patch with pine needles and Stinking Iris grows under the Corsican Pine I gathered them from. No doubt some berries arrived in the mulch. By now the clump was large enough to divide into four sturdy specimens when I took it home.