I am after a bit of advice please. I am clearing an area that has pea gravel on it and under that tarpaulin, I want to make a veg bed in its place for growing courgettes. I have managed to get most of the gravel off of it but would like to know if what is left will do any harm if I dig it in to this border. Our soil is pretty heavy, so am thinking clay.
Thanks in advance for any advice.