We had such great luck with our two mandevilla vines this year, i am trying to keep some to strat next Spring. I took some air layers, and some cutting to root. Of the six cuttings all but one have died. I took the cuttings in late October, and just this week, approx. 8 weeks later my one remaining cutting, has sprung to life with roots! I am so hopeful. I also have the two little air layered plants that started from the mother plant - they are not dead, but they're not growing either. I'll have to keep you posted.