Looks like a lavender that has been taken over by grasses.

Ha. Just need to cut/trim the grass. What lavender specifically?

Does resemble 'Munstead' but I'd be way out of my depth to stand firm with that............guess.

That is correct. It's Munstead, English lavender. Border going around today to protect from further grass-creep.

"Border going around today to protect from further grass-creep."

It may be too late for that if grass has already invaded the center of the plant (which it appears to have done). You will be fighting forever to remove unless it is thoroughly dug out.......and that might also require digging out the lavender at the same time.

id3ma - Did you actually plant something labelled Munstead? If not I am dubious about that id. Munstead is a more compact less rangy plant and has blunter, fatter flower heads afaik. Lavandula angustifolia is 'English Lavender' but not all English Lavender is the cultivar Munstead.

Lavandula officinalis

L officinalis is an older name for L angustifolia. There are hundreds of hybrids and cultivars as well as several straight species.

Either way its Lavender

Floral, are you sure? this really does resemble the many 'Munstead' I've planted over the years. Of course, I'm not getting a real good sense of scale in the photo. My 'Munstead' are easily able to reach 12 or more inches in height when in flower. And let us not forget the impact of growing conditions, soil fertility, etc. in ultimate plant size.

Heh, I said right from the outset that I'm not sure it is 'Munstead', yet here I am arguing to that effect! I don't really know.

There are probably 50 or so registered cultivars of English lavender (Lavandula angustifolia), not to mention the countless hybrids and other species alluded to by floral. Trying to ID a specific lavender from one, not very distinct photo is a bit like trying to ID a specific Japanese maple cultivar from a single leaf :-) You are just as likely to get it wrong....perhaps more so......than get it right!!

No, I am not sure. Note that I have not made any attempt to id this plant positively, only to urge caution over the idea that it is Munstead. As GG says, unless you are an absolute expert, identifying a Lavender even with the plant in front of you is hard. It's well nigh impossible from a photo.

It is very likely that the true Munstead raised by Gertrude Jekyll is long lost since it would have to be grown from cuttings to be the true clone. Since 'Munstead' seed is now sold there must hundreds of variations going about under the name.

Well that right there is 100% more than I knew about 'Munstead', lol! I got on a lavender kick a few years back, expecting it not to work out so well here in the land of cold, wet autumns. To my surprise and delight, quite a few have indeed survived. A much better all-around hardy perennial/rock garden subject in this state than I would have expected. Smell nice too. In fact, aside from perhaps a newly cut balsam fir Christmas tree, is there a better smell in the world?

You like the smell of lavender-try its cousin Rosemary!

Just an FYI I saved this wonderful lavender by installing a nice border, ridding of the grass that was withing the border, and adding some cloth and mulch so it wouldn't get infringed upon any longer. You can tell how happy it is!

Some hearts will be sinking at the mention of cloth.... However, it's just a small area so when it gets weedy you can get rid of it and just go with the mulch. To stop grass infringing you can cut a shallow, sharp edged v shaped trench around the bed with a spade and keep it trimmed.

Any chance of a new picture to see how it's getting on?

Yes indeedy, rosemary is the third member of the good-smelling triumvirate, maybe the best of the three!