Don't use sand it will mix with the fine clay and make cement and ruin
your good soil. Continue with organic matter.

Derryl


I have an allotment with a very clay soil. Plenty of muck and compost
helps but I believe that I need to add some coarse grit or sand to help
break it up. Horticultural sand is quite expensive so can I use builders
sand or is it treated with chemicals that would harm my soil and
vegetables? Or has anyone got any other suggestions?