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You could add gravel or grit surely
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If you add sand of any variety, wash it through first as it is generally saline. Sharp is your best bet. Alternatively, as others have noted most bought compost is pretty much nutritionally bankrupt.
Any builders merchant shingle also needs washing for the same reason.
I know you're in NI, but not sure how close you are to the coast, the ideal solution would be to dig a few bags of sandy coastal soil from just inland.
littleK
Colin_the_Bald
@JWestland
I dug out a part of the grass to sow wildflower seeds.
The ground is clay and somebody suggested ti add poor soil on top. But of course garden centre top soil is nutrient rich and building sand is not suitable. I need to cover 3*3 meters and don't have a van so delivery is needed.
Being a consumer customer and in NI rules out special wildflower turf shops..
Any suggestions? Should I just add sharp sand? B&Q has that at least, I can just rake it in.