https://duckduckgo.com/?q=Petunia+propagation+cuttings&t=ffcm&ia=web

L̶e̶a̶r̶n̶ ̶h̶o̶w̶ ̶t̶o̶ ̶s̶t̶a̶r̶t̶ ̶p̶e̶t̶u̶n̶i̶a̶s̶ ̶f̶r̶o̶m̶ ̶c̶u̶t̶t̶i̶n̶g̶s̶ ̶R̶e̶a̶d̶ ̶m̶o̶r̶e̶ ̶a̶t̶ ̶G̶a̶r̶d̶e̶n̶i̶n̶g̶ ̶K̶n̶o̶w̶ ̶H̶o̶w̶:̶ ̶P̶r̶o̶p̶a̶g̶a̶t̶e̶ ̶P̶e̶t̶u̶n̶i̶a̶ ̶C̶u̶t̶t̶i̶n̶g̶s̶:̶ ̶H̶o̶w̶ ̶T̶o̶ ̶R̶o̶o̶t̶ ̶P̶e̶t̶u̶n̶i̶a̶ ̶P̶l̶a̶n̶t̶s̶ ̶h̶t̶t̶p̶s̶:̶/̶/̶w̶w̶w̶.̶g̶a̶r̶d̶e̶n̶i̶n̶g̶k̶n̶o̶w̶h̶o̶w̶.̶c̶o̶m̶/̶o̶r̶n̶a̶m̶e̶n̶t̶a̶l̶/̶f̶l̶o̶w̶e̶r̶s̶/̶p̶e̶t̶u̶n̶i̶a̶/̶p̶r̶o̶p̶a̶g̶a̶t̶i̶n̶g̶-̶p̶e̶t̶u̶n̶i̶a̶-̶c̶u̶t̶t̶i̶n̶g̶s̶.̶h̶t̶m̶
̶

Sorry, Albert, but the Gardening Know How site is full of horribly inaccurate information, so I really wouldn't recommend it.