Propagating Rosemary (lavender, etc.) - How-to root in water, but water roots are weaker than those started in soil. Commenter Sebette says: "I have my rosemary cuttings rooting nicely in damp potting soil in old six packs. I worked on an herb farm doing propagation and we did all the perennial herbs this way. Cut 2-3 pieces about 3 inches long, strip off the lower leaves, dip, poke hole in soil, place in hole, snug in and wait. By putting in more sprigs to start you get a bushier plant."