Lavender Hedge Problem

[Garvey]

I have a low lavender hedge edging my lawn. It a beautiful feature and something we're all proud of.
However, recently grasses from the lawn have grown through the lavender. Picking out the grass is a chore and never clears the problem.
Does anyone have any tips on clearing the grass?

[Aberdeenplotter]

It is a nightmare. I carefully apply round up gel. It's that or pull it up,dig out the grass which is probably couch and start again

[Two_Sheds]

Dig them all up while they're dormant, take out the grass, put down a mulch (weed membrane?) and replant your hedge.

[indian]

I have lavender and have wanted to move them,some say know others yes,but all my friends in the village say i could loose them,comments would be appreciated,I live in Bulgaria.Thanks