Monday, February 27, 2012

Hybrid hugelkultur

From what I can understand, classical hugelkultur consists of piling up logs and branches, filling over with topsoil and planting on top.  The decaying wood adds fertility and heat to the heap, which is good for the plants growing above, and it also provides some heat to the heap.  I'd never heard of hugelkultur until I read about it on Craving Fresh, I thought at the time that it was an interesting concept, especially when we have such cold winters here, but I wasn't sure what to do with it.  Then someone from our permaculture group sent around another link with some great pictures and I was even more interested, but still not sure what to do.  The problem is that we lack topsoil as it is, and I wasn't going to buy any.  We do have plenty of logs that are too big for the mulcher though, so I was still interested.

Then we went to a permaculture techniques day with our permaculture group, and looked at some hugelkultur and swales at the Bottle Tree Hill Organics farm.   Swales are kind of like contour banks across slopes, consisting of a trench uphill and a mound downhill, used to hold water on the surface of a slope for longer, to allow it to soak into the mound of dirt and to direct water towards dams etc (diagram and info here).  We have plenty of slopes, erosion, dry spots, so we could definitely see the need for swales of some kind, or maybe more like Peter Andrews style contour banks to direct water and fertility (a contour bank doesn't have so much of a trench on the uphill side).  Even though we have the little tractor, we weren't sure that it was up to the task of digging trenches and building mounds on a large scale.

We decided to build more of a hybrid hugelkultur-swale to help with the rehabilitation of the particularly eroded area on our property and as somewhere to plant any extra seedlings!  The hybrid hugelkutur consists of a pile of logs and branches on the slope above the drain, which has virtually no top soil left.  On top of that, I put 3 wheelbarrow loads of cow manure and then a big load of hay (that our ungrateful lovely cattle didn't finish from their last round bale).  The logs are positioned to stablise the heap and prevent from washing down the slope in the next heavy rain.

Our hybrid hugelkutur-swale-contour thingy
The next step was to plant out seedlings and seeds on the mulch.  My aim here was to grow anything that would produce green material to add to the fertility of the soil in the hugelkultur, so I added any extra seedlings or divisions that needed a home, including parsley, dill, geraniums, comfrey, arrowroot, marigolds and cherry tomatoes.  The main thing was that all the plants were safe for the cattle to eat if they did escape the safety of the electric fencing around the eroded area.

Unfortunately the first part of this summer was not as wet as initially forecast, and the occasional 10 mm of rain here and there, interspersed with impossibly hot days, was not enough to sustain all the plants, particularly with no shade over the mound, and some plants didn't make it.  I tried to be blase about the hugelkultur, but I did end up taking water buckets up there and giving it a few drinks, just to keep something going (if only the microbes and the worms).  Now finally it has rained, and I can see that some of the plants are doing well.  Its quite fun having it as an overflow garden.  It doesn't matter what survives and what doesn't.  It doesn't matter if I don't ever harvest anything, and it doesn't matter if its full of weeds, as long as something is growing up there and starting to establish some top soil on the slope.

Already we can see sediment and organic matter accumulating on the slope above the hugelkultur, this is all fertility and potential soil that would have been washed away in the past.  Last year I did pile grass clippings on the area, but without the logs to stabilise the heap, it didn't last long.  We also learnt that its better to spread out a small thick pile of grass rather than spread more thinly over a larger area.

Since building the first part of the hugelkutur we have continued to to extend it across the slope, with more logs, manure, grass clippings and hay as they become available.  I also put down some wet newspaper under one part of the pile because the pile of useful newspaper was getting too big.  And when we spent some time weeding the garden, the whole lot when onto the hugelkultur as the compost was full.  We hope this will be the beginning of building top soil and eventually a stable grass cover in this area.

If you are wondering how this would work in a smaller garden, see the post on Craving Fresh.

Sometimes it takes a bit of thinking to work out how a permaculture concept can work on your property, at your scale and with your resources, but when you come up with something that works, its a great feeling!  

Have you tried hugelkultur?  




Each month in 2013 I reviewed a principle from David Holmgren's Permaculture: Principles and Pathways beyond Sustainability:


14 comments:

  1. excellent! I love that word, and it does take a rather large piece of property to find place for one. It looks as though you have found the perfect spot. I have no doubt that it will eventually breakdown and you will have good friable soil where you can grow another veggie patch!

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  2. I like this idea. My vegie garden beds need a major overhaul and I'm thinking that maybe I could dig them out, put in plenty of leaves, sticks, smaller bits of wood, mulch etc, cover them over with the earth and plenty of fowl manure (the pen needs cleaning out)the plant. It would build up the beds and if it helped with water retention (and from what you have said and what I have seen online) it will then that's a bonus. I figure I have nothing to loose and if it reduces the huge pile of eucalypt prunings from two trees that snapped off in the wind then that's all good. Thank you for sharing the idea.

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  3. I think its worth a try in any size garden, you can't do any harm and it helps to tidy up (better than having a bonfire!).

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  4. ......... though I must confess to loving a good bonfire!

    Very interesting reading, thank you. It's got us talking again about a very sad looking paddock on a hill. One of these days we will actually start experimenting to find the best method of improving the soil. Spreading manure, straw, swales and now hugelkutur to choose from! Maybe a bit of everything. Who knows?!

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  5. This is great. I am working on a mini Hugelkultur in my garden so it is fun to see how others take the concept and apply it to their property.

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  6. Great post Liz. I was wondering if you could speed up the process by purchasing a few square bales of sugar cane mulch (if you can get them cheaply enough) and use them as a swale. Don't untie them just build a wall from them across the slope. After a while they break down enough that you can plant directly into them. this would cost some money but if you could find some really wet ones that were on sale it might be worth it as you want them wet.

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  7. thanks Fiona, actually we are planning to buy some mulch roundbales for stage two of the hugelkultur as soon as we see some cheap ones. I reckon any free/cheap organic matter can be added into the mix!

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  8. Hi Liz

    We went the swale option but will be adding to it with some logs from old wattle trees soon. Here is a link to the last post though everything is twice the size now after the summer rains
    http://barefootbounty.blogspot.com.au/2012/01/swale-update.html
    Its working a treat with our steep slope.

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  9. We have a VERY steep hillside in our backyard and I tried my own version of this. I used banana stumps, which are very wet, along with branches and such. They actually seem to be staying in place (not rolling down the hill!) and I've got pumpkins and sweet peas sprouting, as well as a couple of new dwarf banana trees growing. Curious to see how it stands up to time.

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  10. Hugelkultur seems to be the gardening trend of 2012 - I'm even planning to try it out myself. I figure that if I make one high enough that it could be an extra gardening space (your own rationale) as well as a wind-break for my hive.

    From what you've said in your post, the mini hugel-hump you created this year has done pretty good considering that you've left it on its own for much of the time. Imagine being about to use that technique across more land that isn't as productive at the moment! You'll be the pumpkin queen of Australia :)

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  11. It does seem very fashionable to be hugelkulturing this season! I suppose that's the only reason that I found out about it and gave it a go myself. Great to see some other examples, seems like it can work in many different situations. Feel free to leave a link in your comment so everyone can check out what you've achieved.

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  12. Hey Liz,

    I love it how you're always adapting what you read for your environment.

    How exciting that organic matter is building up at the top of your swale. (I like that word. Swale. It makes me want to build one, just so I can say swale a few more times. Although I like saying hugelkultur too. Did not realise it was getting fashionable though. Will have to tell my mother-in-law that she's hip!)

    Did you ever find a good source of coffee grounds other than your work. That's another green matter you could add to your swale.

    xx

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  13. I am gonna link this to a post I am doing!

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  14. That's great Clint, please post the link back here so that everyone can have a look. If anyone else has built a hugelkutur or is just thinking about it, feel free to post a link!

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Thanks, I appreciate all your comments, suggestions and questions, if you need me to reply personally to a question, please leave your email address in the comment or in your profile, or email me directly on eight.acres.liz at gmail.com

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