If it's an older variety (typically more than 20 years old), you can propagate mandevilla from cuttings by doing the following steps: Cut a piece a few inches long from the tips or side shoots.

If you successfully plant your mandevilla in a shadier area ... The best time to propagate them is during the spring or early summer when the plant is actively growing. To propagate, select ...

If you successfully plant your mandevilla in a shadier area ... Yes, Mandevillas can be propagated easily through stem cuttings. The best time to propagate them is during the spring or early summer ...