I always thought new growth was a sure sign that cuttings had rooted. This week I learned otherwise. When spring came, most of my rosemary cuttings grew fresh green leaves, and at least half of them have flowers. There are 18 cuttings in three pots. When I tipped them out to pot them on, only two had any roots. I potted those up singly, and put the rest back as they were. Is this usual? Is there anything I can do to promote root growth? I have an ancient (40+ years old) pot of hormone rooting powder; is it likely to be any use? And is there any way of knowing whether cuttings have rooted, other than tipping them out?