I have a small yard at the beach whose yard was an overgrown jumble when we bought it. I have spent the last several years pulling ivy and buttercups. I have been able to thin out the bluebells to a managable level but just these past two years I am suddenly overrun with False Lily of the Valley. I used to think it was lovely but it is so invasive and by late summer it's a dried up scraggly mess. It's in the grass and chokes out the sweet peas I used to be able to tuck in amongst the shrubs. I know for some gardens, it's a lovely ground cover but it's not working here.

I'm not necessarily looking for eradication but I do need to know the best way to control it.

Any suggestions or similar stories would be appreciated!

Possible ideas to help you:
dig a trench & install edging
hand remove as much of it as you can out of the lawn before it goes dormant in summer
layer over lawn with cardboard, compost & replant in Sept
(I'm not sure if that will prevent it from emerging back through the cardboard in spring when decomposed.

When removing try to get the root.
Use a strong tool to help you: screwdriver, weeder tool with a little fork on the end, metal trowel. I have a diggit tool that really grips the roots when prying them out, so is worth the $.