In article , caterbro
wrote:

can i slash tender new green stems off my favorite bushes and plunk
them in good soil and expect them to live?

No
You need stems that have flowered

if i throw the bottle over
the plantings and love them and stuff?

No
You'll probably cook them. Try using open-topped gallon-sized plastic
milk jugs.

i envision a row of glinting and humid glittering hemispheres of 2l
bottles nurturing my rude cuttings jammed into a nice little garden
bed...

Why not just put the bottles out, if you'd like.

Read about propagation at the American Rose Society website:

http://www.ars.org/explore.cfm/articles/