A simple way to propagate new plants is a method called layering. Forsythia plants do this every time a branch touches the ground, within an hour roots are starting to grow and a new forsythia plant is started. I may be off on the amount of time it takes but an unattended forsythia bush soon becomes a jungle.
My pink rhododendrons are also very good at rooting new plants. My white rhody is a little slower and my red rhody is very hard to get to root. So my yard has a lot of pink rhodies, a fair number of white ones and just a few reds.
I have bent lower branches of dogwoods and rose of sharon down to the ground, staked them down and cover the stake with compost to propagate new plants. The dogwoods generally root in a year and can be dug up and planted in a new location the next spring. The rose of sharon needs more time to root. I have done it in a year only once, failed on a couple of tries and succeeded with a year and a half to two year time frame.
I’m trying the rose of sharon again this year and my magnolia tree. I’m not staking them this time, I think the stress of the bending is part of my failure rate. I’m threading the branch into the side of a plastic pot for the rose of sharon and into the side of a wooden bottomless box for the magnolias. Time will tell if this will work.