Progress of one of the cuttings from last year,
Everything I've read suggest the only way to propagate these is by seed. (needing a male & female plant for pollination)
If anyone else has knowledge, or access to these, would be curious to know if vine cuttings are rooting from other plants.
I wait until blooms are starting, cut about a 6" length, then just bury a few nodes under the soil. (leaving the leaves attached to supply some energy & reserve)
After about a month, the old leaves drop off and new growth starts.
Steve