I garden on clay good clay at the top then a layer of dead clay wich nothing could survive in then below that chalk, I do add different things to the soil to try to make it more pliable but it remains very heavy to dig, waterlogged in winter and cracked up in the summer, I live on a very steep hill side ways on to the garden and it seems that all the nutrients that I add leach off into my neighbors garden, shame they only grow weeds and rubbish.but I do keep struggling on to try and maintain it