On Fri, 07 Mar 2014 19:15:42 +0000, Chris J Dixon wrote:

AL_n wrote:

Anyone advise which kind of bagged compost or esily-available waste
vegetable-matter or mineral is best for adding to very heavy clayey
soil, prior to sowing with grass seed? I'm going to need a a few cwt, so
if it's cheap, I'll be happiest!

Gypsum is recommended as a soil improver, but appears to be sold in
garden centres as a proprietary product costing over £6 for 2.5 kg.


We used to buy gypsum from the agri coop for, well, cheap. Don't know if
this is still possible. But it was effective in the veg garden.

-E



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Gardening in Lower Normandy