Underground greenhouse
by Diane - November 25th, 2013.Filed under: allotment.
Build an underground greenhouse
This is probably just a pipe dream for most UK allotmenters. The regulations on most allotment sites wouldn’t allow you to build one of these underground greenhouses and indeed the stats of the soil on many sites would preclude it too – unless you were aiming for a swimming pool.
I know on my allotment there’s clay not far under the surface and it’s very deep so you’d be digging out a huge amount of clay – which you’d have to put somewhere. If it didn’t leak in then it’d be dry but if water found its way in you’d basically have built a pond for it to fill.
I also think that it’s likely to be a bit risky in softer soils where the sides would need lots of reinforcing.