Posted: 17/03/2017 at 15:57
Yes, dig it out carefully - cut a circle and try to peel it back, perhaps using a knife of even a wall-paper or paint scraper type thing. I don't like stone mulches - I think they absorb the heat of the sun and can dry the soil out beneath them, or even get the roots too warm.
I'd top up with some loam (JI No 3) mixed with some leafmould or similar. And then every year I'd feed and then mulch with either homemade compost or bought in soil conditioner or well rotted manure.
Do the blackbirds really make a lot of mess - they don't here and we have a lot of them - won't Dudley see them off?