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Raised bed over concrete, what for a bottom?

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Posted by buggalinajujubee BayArea CA 9/14 (My Page) on
Sat, Mar 12, 11 at 11:51

If you want to put a raised bed over a concrete path, do you need to have a wooden bottom or can you staple that landscaper cloth inside to the bottom of the box to hold in the soil better?

My husband made me square boxes with a wood bottom and drainage holes drilled in. It worked fine last year. This year I am considering purchasing some raised beds but there is no bottom. I go for a minimum of 12 inches deep with all my boxes.

Thanks,
Julie

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RE: Raised bed over concrete, what for a bottom?

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Well, my problem with a wood bottom is that eventually it will rot out. Plus, unless you have drainage holes it'll become a bath tub. For concrete, I like the idea of stapled landscape cloth at the bottom to keep as much of the soil from escaping. I think a that would likely solve your drainage issues as well. Just my thoughs as I have gravel under mine, then dirt. GL!

Here is a link that might be useful: Sinfonian's garden adventure

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RE: Raised bed over concrete, what for a bottom?

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I have raised beds sitting on my driveway.

In all honesty, I didn't put anything underneath. I just made the four sides and filled with dirt.

It is going to look very bad if I get rid of the beds (or we move to another house). I'm sure the concrete will be stained.

Here is a link that might be useful: My Garden Blog

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RE: Raised bed over concrete, what for a bottom?

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I put boxes over asphalt to make a school garden. The bottom was lined with landscape fabric to prevent the soil from washing out. They've been in place for about a year now and everything is working out well, except for the aphids.

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