I really wanted to add to my Lavender and Rosemary plantings this summer without added cost, so I used my Auntie's age old method for her roses of using jars like mini-greenhouses. I know you can also layer the plants, but I haven't had much luck with that technique.
After stripping the branch of leaves except for at the vary top and exposing some of the white stem part underneath, I put them in the loose soil and I kept the ground wet and the jars over the top.
I didn't use rooting hormone. I wanted to see what would happen with out it. I had read somewhere that you can root both plants in water, so I thought, why not, what have I got to lose?
It took about 3 weeks, but then I had roots!
Once they are established I keep them moist. Anytime I have carefully removed them to check for roots, I've put them back in in saturated soil and replaced the jar. It was so easy and cheap. I've started saving them from everything like salsa and pickles.
My garden looks like it is growing glass jars.