I have about 9 Euphorbia chacarais wulfenii in pots which I bought a couple of years ago for the Great Border Project which for various reasons got delayed until this spring when I have finally got the ground in order for planting. During their spell in their pots and being shunted around, blown over in the gales, and generally ignored, they have become leggy and not looking their best although still valiantly flowering. I have now planted them as my 'punctuation points' but they need cutting back and rejuvenating. Can anyone tell me when the best time to do this is and how close to the ground should they be taken back to? at the moment they are about 2' high but only flowering/leaves at their extreme tips.