Posted: 30/07/2012 at 12:50
We have an area of concrete, the size of two old cottages, so fairly substantial. Some of it we have gravelled and use as a seating area in with a Gazebo. However, the rest I coverd with top soil, held in place by large boulders, so in effect a raised bed. The soil depth is about 18 inces or so. I have filled it mainly with herbaceous stuff. Round the edge of the gravel area I planted Bamboo and Miscanthus of a giant form. the concrrete has stopped them from becoming too invasive.
We did find another area which had a concrete base of about 2m by 1m. We guessed that it was the base of an old outsoor toilet. No drains, just a bucket to be meptied onto the garden eventually. That we did remove. Underneath it was a huge mass of small boulders. I used them to make the raised beds. Even worse was the area in front of it had a deep pit which was where the cottagers had put all their broen glass and potters. I only managed to clear the top 2 feet of that and it was still gong down. Hope you area is just the base of say a coal bunker.