I'd want to get all that grass around it removed. It will continue to grow and choke out the lavender, eventually.And it looks messy :-)

Other than overwatering that can lead to root rots, nothing else really bothers lavender. Certainly no insects that I have ever encountered - all in all, a very trouble-free plant! From time to time, older stems can die off and they can be removed. And the plant should be pruned back twice a year - once lightly in late summer or early fall to remove old flower stalks and tidy up the upper foliage and again in spring once the new growth becomes apparent. This can be a harder pruning to keep the plant dense and compact but never cut back below existing the foliage into the bare wood.

Did not know the grass would kill the lavender. Thanks for the information! :-) Will take it off around the plant. Well, it really looks messy, I have no way with caring ornamental plants! :-) I work in my small plot growing all sorts of legumes and there is a small orchard too. But I like flowers, and yes, you are right, I will spend more time on caring the lavanders. There are a couple of roses too. Just straying a bit outside the subject, this rose in the picture is around 1.70 meter high and is very interesting because it never catches mold, while others I planted there I need to spray them a couple of times per year against mold or they will die. Its flowers are big, like 13-15cm diameter and with perfume. I wonder if this resistance to mold could be somewhat passed to other rose cultivars. I just prune it a bit every year and no worries about purchasing chemicals. But, back to the lavander, I am glad to know that is not a lavender sickness, but died naturally. I will cut the old branches off. The other bigger lavender in the background needs also a hard pruning, never did it since 2009. Many thanks for the advice!

I agree with everything that gardengal said. Be aware, too, that lavender, like other plants, has a life expectancy. Perhaps your plant is reaching the end of its life span, given that you've had it for a number of years. My lavenders typically produce babies after several years. The grass might have discouraged the spread of your lavender.

Deb, thank you. How are those lavender babies? They grow from the stems?