I have started to build platforms for my elevated garden railroad. I am adopting Richard Smith's system of making 2x4 frames covered with screen and landscape fabric. My table tops will have 2" of soil when I am done. I know Richard isn't overly concerned with real plants growing on the platforms but I want to have a lot of real plants around the tracks and structures. I have standardized on platforms that are 4' wide by 8' long. I have made 20 so far and have them stacked in the yard waiting to be installed on support legs. Is there a source where I can look up the type of plants that will thrive in soil that is only 2" deep? I know plants for rock gardens such as hens and chicks will be OK but I want to see what else is available. When my layout is finished I will have about 200' of table tops circling around the back yard. I will post a photo once I get them installed. Need to wait for the spring thaw to dig holes for the support legs.
John
John