In article , Dan S. MacAbre wrote:
I'm looking at a Rosemary bush in the garden which has got a bit scruffy
this year. I don't want to accidentally kill it off, because it's nice
to have fresh Rosemary available, but looking at the stems, I'm guessing
that it doesn't grow from old wood. Or does it?

No. And it has anything from a 5 year lifetime upwards, depending
on the conditions, garden and God knows what. It layers fairly
easily, so put half bricks on top of a branch or two (burying some
not-too-old wood) and leave them for a year or so. When well
rooted, they can be cut off (and transplanted if wanted).


Regards,
Nick Maclaren.