The site is on an area which is predominantly heavy London clay, which is located at varying depths beneath a loamy topsoil. The clay is invariably encountered at depths greater than 18 inches and its combination with the loam makes for a fertile soil suitable for the cultivation of most garden crops.
The lower part of the site is wetter than the top where the soils tend to be more sandy (which means of course there is more watering in dry periods). Although cultivated for many years, all soils will improve with the addition of manures and composts.
The site has been cultivated for many years and occasionally you will come across little treasures in the form of pipe fragments, pot shards, even fragments of china dolls have turned up. The site's rich history is encompassed by these items so keep those eyes peeled when you are digging, you never know what little treasures will turn up.