I bought a buddleia davidii in a 7 inches pot. It was about 3 feet high and in stable condition. i transplanted it in my soil bed few weeks ago. Temp is around 100F here and it will reach around 125F in May. First, the edges of some mostly upper and some lower leaves turned brown. Then whole upper leaves turned brown and curled/crispy. The nursery man told me that roots of this plant must remain cool and well drained. I am sure about well drained but not about being cool. I have got few options for mulching. Peat moss, coco peat, shredded leaves etc. Any clue?