Hello all
I too after 7 years growth have dieback. Just a small section in the centre of the plant so will do as suggested just cut it out and keep my fingers crossed. However, some adjacent lavender also has something very similar to dieback and it is decimating each lavander one by one. I just cut it out and hope for regeneration. I know that lavander is a short lived plant so they may have just come to the end of their natural life or not. As to variety, who knows? In the garden centres here they just come as either lavander or rosemay and you get what you get, weeping or other wise, quite exciting really but not condusive to successful planning. All plants just survive on winter rain as I am up in the mountains during the summer.
Any suggestions gratefully received.