Lamium is not invasive/aggressive. You have confused it with Lamiastrum galeobdelon (except in the form 'Herman's Pride') which is invasive.

'Lacey' it doesnt come across well in a post as I was being a bit tongue in cheek; the lamiums I have had experience with might not be invasive but for sure they are hardy and vigorous .

I have likewise seen a similar broad skirt of lily of the valley under a large tree, apparently kept in check by simply mowing. Thanks for posting this example.

if that is a maple .... they were lucky to find something that would thrive in that situation ...

i would suggest they get rid of the juniper with tip blight ... and let the lamium finish the job ...

and i suspect the edging of the bed.. takes care of them creeping out of there ...

lets give them 2 green thumbs up.. for finding a thriving solution .. carefree mind you .. for a spot which might have been hard to fill ... [once a year edging is still rather carefree...imo]

ken

I agree Ken ie ditch the juniper. But given it has been there for so long I am betting it stays.

(Not a maple...maybe a catalpa tree of some sort)