- Dec 15, 2015
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Looking for some thoughts on a keyhole garden. For any unfamiliar, it's a compact/efficient garden, about a 6' diameter circle with a compost hole in the center, and a small 'keyhole' to permit access to the hole itself. 'Bout 32"-36" high at the edge, 36"-40" at the center.
Realistically, I've got four materials I can build with. Treated wood as above, rock aggregate that's large enough to actually dry stack with, pavers, and cement blocks.
-Wood-
Pro: Straightforward construction, probably pretty stable due to using some kind of rod/stakes to secure the layers. Doesn't take up much room. No real concern about chemicals with newer stuff. Not bad on price.
Con: probably lasts the shortest amount of time (I'm seeing 7-10y cited as lifetime of pressure treated in contact with soil). Most expensive. Labor intensive to build (I only have a circular saw).
-Rock-
Pro: Looks pretty killer. Almost free (combo of gathering and cheap purchase). Last forever. Zero concerns of contaminants.
Con: Very labor intensive. I'll probably be terrible at stacking rocks and fail miserably. Frost heave will likely create a lot more work for me come next spring.
-Lipped pavers-
Pro: Looks pretty good, very clean and intentional. Lasts forever. Easy to assemble, not likely to be subject to heave.
Con: Most expensive. Very labor intensive. Moderate concerns of fly ash, alleviated by planting sunflowers amongst my crops.
-Cinder Blocks-
Pro: Easy to assemble (if heavy). Should last a long time, if I brace it correctly (rebar through the holes to prevent frost heave from shifting?). Not terribly expensive.
Con: Looks pretty ghetto. Same issue with fly ash. Still labor intensive.
Based on my calcs, I'd need somewhere around 220 12" pavers, or around 90 cinder blocks for the circle. I could make it a little smaller to save time/effort, but I'd rather not. Might be an alternative configuration that could get me more with less though. Here's some scribbles of my design concept.
~23' circumference to field a 6' diameter internally, costs for pavers on the left, cinderblocks on the right (I was primarily considering those two).
My inclination is to just bite the bullet, get the lipped pavers, do this whole thing once and call it good, in comfort that I won't have to do it again and won't spend much, if any time rebuilding in the future.
Thoughts, concerns with usage of any of these materials, or has anyone done this before that can give me tips?
Realistically, I've got four materials I can build with. Treated wood as above, rock aggregate that's large enough to actually dry stack with, pavers, and cement blocks.
-Wood-
Pro: Straightforward construction, probably pretty stable due to using some kind of rod/stakes to secure the layers. Doesn't take up much room. No real concern about chemicals with newer stuff. Not bad on price.
Con: probably lasts the shortest amount of time (I'm seeing 7-10y cited as lifetime of pressure treated in contact with soil). Most expensive. Labor intensive to build (I only have a circular saw).
-Rock-
Pro: Looks pretty killer. Almost free (combo of gathering and cheap purchase). Last forever. Zero concerns of contaminants.
Con: Very labor intensive. I'll probably be terrible at stacking rocks and fail miserably. Frost heave will likely create a lot more work for me come next spring.
-Lipped pavers-
Pro: Looks pretty good, very clean and intentional. Lasts forever. Easy to assemble, not likely to be subject to heave.
Con: Most expensive. Very labor intensive. Moderate concerns of fly ash, alleviated by planting sunflowers amongst my crops.
-Cinder Blocks-
Pro: Easy to assemble (if heavy). Should last a long time, if I brace it correctly (rebar through the holes to prevent frost heave from shifting?). Not terribly expensive.
Con: Looks pretty ghetto. Same issue with fly ash. Still labor intensive.
Based on my calcs, I'd need somewhere around 220 12" pavers, or around 90 cinder blocks for the circle. I could make it a little smaller to save time/effort, but I'd rather not. Might be an alternative configuration that could get me more with less though. Here's some scribbles of my design concept.
~23' circumference to field a 6' diameter internally, costs for pavers on the left, cinderblocks on the right (I was primarily considering those two).
My inclination is to just bite the bullet, get the lipped pavers, do this whole thing once and call it good, in comfort that I won't have to do it again and won't spend much, if any time rebuilding in the future.
Thoughts, concerns with usage of any of these materials, or has anyone done this before that can give me tips?