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keyhole garden design

Posted by genuineimitation 7 (My Page) on
Tue, Jul 8, 08 at 16:02

hi, i saw a keyhole garden made in africa on youtube. (sorry, i don't know the exact link, but if you search keyhole garden on youtube, it will come up..) i didn't understand one facet of the design, and don't have enough permaculture know-how yet to figure out how it works:
they build a keyhole garden, and in the round part put a "basket" which is there to hold compost and rainwater. ok, i get that it acts as storage, but i'm not sure - do they pull compost out to use? does it somehow seep into the garden? is it really there as a compost bin or is it more of a framework to hold up the winter covering of straw? any ideas?

any good sites for keyhole gardens would be appreciated - i'm searching books and the web to try to create my first one. thanks


Follow-Up Postings:

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RE: keyhole garden design

The basket is not really storing water. As I see it the basket gives a convenient way of adding water and compostables directly into the root zone of the plants grown in the keyhole garden. Adding the water in this way will help to reduce losses to evaporation. The water will also aid the breakdown of the other ingredients in the basket.

The compost is made "on-site" so there is no need to remove it from the basket, any nutrients that leach out of the compost are immediately in the growing plants root zones. Indeed the roots will grow into the compost itself.

As the vegetable scraps, etc, added to the basket decompose they add nutrients to the garden. The basket itself would eventually decompose and would need to be rebuilt, again using local branches and sticks.

The keyhole garden takes the best ideas from lasagna/sheet mulch, rain gardens, composting, no-till, and combines them in a neat little package.

Cheers,
Kyle

Here is a link that might be useful: Keyhole Gardens on YouTube


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RE: keyhole garden design

Interesting approach. Sort of the ultimate raised bed. I am a huge fan of keyhole and make all me beds that way (not raised per the video though). The style in the vides is quite intensive - lots of rocks and lots of resources (waist height) placed into one location. For those that can great but by my calculations, you would need about 6 of these beds to feed a person completely. Thats a lot of work to setup unless it is a full time effort. Otherwise, world class.

And the basket idea is great. For those digging in the ground just use the aisle as your basket.


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RE: keyhole garden design

interesting to watch, basically but it comes down to a raised agrden bed with adaption, where they are they have plenty of rocks for garden edges free but for the labour to tote them. a keyhole garden can be any shape round as in example or rectangular, usual but they come into their own in very small garden spaces.

for most of is rectangular raised beds works, the basket thingy for them works as i would be guessing organic material might be somewhat hard to get especially straw or hay etc.,. though they certainly need a lot of material imput to begin the garden.

so for us instead of the basket our path/weed barrier becomes much the same thing as we create a recycling of hay in that are it builds soil habitat which then moves into the garden.

use keyhole if you are limited in space, and use it as extra raised as in the example if you have the materials to create it, but a keyhole agrden can only be at normal raised bed height of around 8" give or take and all the way through to the height in the vid'. i also see that in beds that are small space is at a prime so maybe also not a lot of room to mulch around the plants.

we make our beds large enough to allow for permanent mulch around the plants, so no basket method needed. also the rocks would act as thermal mass to help keep the medium warmer in their winters. keyhole allows for use of largest part of space and still allow arms reach access to the whole garden.

this example is gardeners adapting to local conditions(condition means what is available to work with or climate or drought whatever) as many of us have to do so we can garden for food. and gardeners learn other ideas from other gardeners and use those parts that will give the desired result.

len

Here is a link that might be useful: lens garden page


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RE: keyhole garden design

If I use the rocks as edging in a garden in Mesa/Phoenix will I get too much thermal mass for my summer plants? Already decided that raised is far too hot. Will be doing in-ground with raised/lasagne ideas.
Have been seeing some people on a local forum having huge die-offs with true lasagene style gardens as well. I suspect the thermal heat of composting is killing their plants.
Just a thought. I have free river rocks so that would be a great boundary. Would have to buy wood and would have to make the decision about treated/untreated/painted issue.
I only want a boundary that is about 4 inches high to keep the goodies from spilling out as I flood irrigate my garden area with very cheap water. (nearly free, I'm so lucky!)


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RE: keyhole garden design

Yes, the thermal composting is probably what is killing the plants. I'm sure many people have more fresh grass clippings than anything else, and too much of that stuff will do it.

The native peoples of the southwest gardened in depressions to prevent the water from running off the beds. It seems to me that would be a good idea in hot, sandy areas. Hoe the surface of your bed to form a border/berm around the perimeter, loosen the deeper soil with a spading fork, mix in some lime and compost (or compost materials), moisten and let sit for a couple of weeks to break down. Don't overwater or you'll wash away the nutrients.

I'm sure that growing in depressions is probably a bit more difficult than a raised bed, but desert/hot areas have their own problems, and holding water so the soil is moistened thoroughly at least 6-7" deep can be a real trick.

Take trowel and see how deep the soil has been moistened after you water. Just getting the surface wet won't do it.

Sue


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