Hi Boysie and welcome to GoY not that I am aware of. Do you have a weed membrane down to stop weeds growing?

Fluazifop-butyl will do that, but I am not certain it is legal there.

Sorry--that's fluazifop-P-butyl. Oops!

Just plain weed suppressant membrane is I suspect what MG means? Tuqb. Which would be ideal for this job under and around the plant.

Yup that is what I meant Drc.

I think that it is bit late for Boysie to be laying membrane - the cotoneaster and the grass are already there! I know that there are weedkillers that will kill only broad leaf plants and not grass (as used on lawns) and I 'think' that there used to be one that worked the other way but I am not sure about this. You will have to search the shelves at the Garden Centre, Boysie.

Unless the Cotoneaster is horizontalis, membrane is of little use for these plants - Cotoneaster queen of carpets, for instance, spreads through the soil, rooting as it goes, and it can't do that with a membrane in place. And if you find something you can use that does kill grass and not the plant, I'd like to know about it - I'm forever trying to extract couch grass from a ground cover cotoneaster myself, it's a real pain.

The grasses we grow here, primarily Bermudagrass, come right up through membranes, especially through the openings that ground covers would be planted through. Maybe different for those civilized British grasses! : )

As Mr. B said, it's too late for membrane now, unless Boysie wants to redo the whole bed--probably the most effective solution, but the most work and expense.