See https://www.anbg.gov.au/gnp/interns-2013/muehlenbeckia-axillaris.html

Hi, welcome to GoY, sow the seed as soon as it's ripe, in a propagator at a temperature of 66 - 75f, or you can root semi ripe cuttings in summer, with some bottom heat, and this species sometimes sends out shoots which root on their own if they're in contact with the soil, Derek.