Rosemary is usually propagated by cuttings. Seeds can be difficult to germinate and often don't grow true to their parent. It's much faster to start with a cutting and you will be sure of what type of plant you will get. It's possible to root rosemary in a glass of water, but a bit more effort will give more dependable results.
Snip about a 2 inch cutting from the soft, new growth of an established plant.
Remove the leaves from the bottom inch and dip that tip into a rooting hormone. Rooting hormones can be found in any garden center.
Carefully place the dipped end into a container of dampened, sterile seed starting mix. Choose a mix that says it is well draining, like something containing peat moss and vermiculite or perlite.
Place the container in a warm spot with indirect sunlight.
Mist the cuttings daily and make sure the soil does not dry out.
In about 2-3 weeks, test for root growth by very gently tugging on the cuttings.
Once your cuttings have roots, transplant into individual pots about 3-4 inches in diameter.
Pinch off the very top of the cutting to encourage it to develop branches.
Begin caring for your cutting as a rosemary plant.
Source: About.com
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