Hello All. I have 3 mandevilla plants that I have growing in pots. Brought in from outside last year. One has a new sprout out about a foot above the base. Another came out about 2 feet up but is now drying up. Should I cut this vine off above the new shoot that is growing or leave it alone. The other 2 have green vines but only new sprouts at base. No sprouts coming out the green vines. Should I cut these vines off above tne new sprouts. I would be cutting about 2 inches above the bottom. Thanks,Mike In Wisconsin