Good idea to build a raised bed over cement?
Posted: Thu Sep 24, 2009 6:00 am
Is it wise--or completely insane--to build a raise bed directly over my cemented area in the backyard? It's a corner in my backyard cornered by two fences. The bed is 60 inches wide and 16 inches deep surrounded by a strong wall of square bricks. And the dirt wouldn't really be touching the fences to avoid water-rotting them. But my concerns are:
Drainage) Will the water be able to drain successfully?? Where will the water drain to if it's only 16 inches of dirt sitting directly on cement? Should I first put a giant sturdy piece of wood at the bottom of the bed with irrigation holes in it with a number of bricks under it to leave space between the cement and the bed for drainage?
What to plant?) Should I only plant things that are known for having shallow roots since the dirt is only 16 inches deep (and what would those plants be?)? Should I only plant bulbs as they generally don't root too deep?
Here's a quick before-and-after drawing I did on the computer to illustrate what I'm considering building. As you can see, there's already plants growing on that un-cemented strip of dirt in front of the fences.
[img]https://www.toilgirls.com/stuff/gardenbed.jpg[/img]
Thanks very, very much in advance. Thus far this forum has provided me with priceless knowledge.
Les
Drainage) Will the water be able to drain successfully?? Where will the water drain to if it's only 16 inches of dirt sitting directly on cement? Should I first put a giant sturdy piece of wood at the bottom of the bed with irrigation holes in it with a number of bricks under it to leave space between the cement and the bed for drainage?
What to plant?) Should I only plant things that are known for having shallow roots since the dirt is only 16 inches deep (and what would those plants be?)? Should I only plant bulbs as they generally don't root too deep?
Here's a quick before-and-after drawing I did on the computer to illustrate what I'm considering building. As you can see, there's already plants growing on that un-cemented strip of dirt in front of the fences.
[img]https://www.toilgirls.com/stuff/gardenbed.jpg[/img]
Thanks very, very much in advance. Thus far this forum has provided me with priceless knowledge.
Les