Everything I've read indicates Rosemary is best propagated from cuttings...I've not tried it yet, I was waiting to get specific info, but I may try 4 to 6 inch cuttings, with the bottom 1/3rd of leaves plucked off, in a mix of peat and sand. I don't use rooting hormone, but that would help a great deal, I'm sure.
tk...is that one hangin' in there? I've had great luck with RM
plants when sold in small pots like that. Not finicky at all. Just well drained soil and don't overwater. I've never fed mine aside from amending soil when planting. Mine here at home is 3 feet tall, 2 and 1/2 feet wide and has flowered now for 3 months! Still flowering.