I tried propagating morning glory and Tabernaemontana divaricata (which we call safeda or chandni tree here in local terms) from herbaceous stem cuttings, and had excellent results.
attractive bottles ;)
Inspite of all the discouraging content on the internet which says that propagating things without rooting hormones is mostly a failure, i had success WITHOUT it. I just put the cuttings in water and they sprouted roots. However you should keep in consideration that the stems are semi-hardwood- neither too old nor very young. Just a week or so old. This is because the mature stems find it difficult to adapt to the new medium and the young ones are too undeveloped for it. I also find it better to peel off a little surface of the stems.
Morning Glory-initial stage
first root growths
mature roots ready to transplant
Chandni- initial stage
first root growths