lavender

If lavender is pruned right back to the old wood it will not regrow. Your green shoots should grow and bush out. Prune off flowers and a little of green when the flowers are finished and try to see whether you can get it back to a decent shape.

I would start again. It is not strictly true about regrowing from old wood. I have 4 Hidcote lavender plants which are 4 years old , even though I had cut them back each year after flowering they were still very staggly. So I cut them completely to the base a few weeks ago and they are making good growth again.I will try to post a picture sometime.I think if they were very old it would not work.

You need to cut back as far as possible to make it regenerate. Like Wyeboy I have cut mine back into old wood but only as far as a living green bit. They will look awful for a season but it does encourage them to sprout lower down and eventually into a nice shape again. In future cut you lavender back harder than you think you should. My hedge is now ten years old and still going strong :)