How to Propagate shining mandevilla?
Propagate by seed sown with heat in spring, or root softwood cuttings in late spring or semi-ripe cuttings in summer, with bottom heat

shining mandevilla · Mandevilla splendens
Grow in a temperate or warm greenhouse or conservatory in loam-based compost in full light but with shade from hot sun. Young plants can be grown in pots to stand outside in summer. Usually evergreen, but will drop leaves if too cold in winter
Propagate by seed sown with heat in spring, or root softwood cuttings in late spring or semi-ripe cuttings in summer, with bottom heat