Sedum is a genus with a long history of decorative, medicinal and edible use, well known to many gardeners, with long popular plants for physic gardens, rockeries, walls, rooves (including modern style green rooves), perennial borders and houseplant collections. It is also one of those huge old genera packed full of hundreds of not always very closely related species. As studies have continued over time, including genetic studies in recent years, many plants have been separated out into smaller genera, including some important in gardens such as Hylotelephium ( often late flowering, herbaceous plants, such as Autumn Joy), Phedimus (typically partially deciduous, low-growing ground covers, such as the spurium types, with serious flower power). These changes are not universally known or accepted, so you will still see the plants often labelled as Sedum. Now here is where our subject for today gets a bit more controversial: Phedimus. As mentioned, this genus is the home of a number