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Grass regrowing in new border (see pic)
I cut out new border in February with a flat spade. Any advice how reduce this growing back.
I know nature loves to fill an empty space and have some Gernaium and Rose Carpet to do that but they are just establishing so for a good while there will be an empty space.

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I feel your pain. Top is august 2020 was an 'in progress' when we had to completely hand dig out a massive new bed that was previously just overgrown leylandii. As soon as we removed the trees it went to complete pot during lockdown due to inability to get bark mulch etc. Bottom left was the same area last June after two years of growing in. Bottom right is it a few weeks ago so at it's wintery worst but the weeds and stray grass seedlings are still so much less noticeable these days and far easier to pull up. Mulch does wonders but it needs to be thick and that first few years hard work will pay dividends when the plants do grow in a bit. I find an oscillating hoe flies through the small stuff but it does smoosh the bark mulch into the soil so push it back before doing battle. Good luck!
Otherwise, hoeing and thick mulching is the answer, and/or lots of ground cover. The mulch in your photo isn't enough to suppress weeds, but a few inches will make a difference, and make it easier to get out any weeds that seed in from above. Anything perennial would need dug out, or dabbed with weedkiller depending on your approach and the amount of time you have.
I live in west central Scotland - not where that photo is...
@ontopofthehill Lovely to see your beautiful garden!