I 'stole' 4 cuttings of a Buddliah from a wayside hedge on May 22nd,I cut just below a node (joint in the stem) on a 3/4" stem taking off the lower leaves and just stuck them in a pot of soil, they have rooted already and even have Minute flower heads on one of them. Have now got to decide where to plant one of them when they are stronger..good luck with yours.