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The great thing about livin' the permaculture life is that you also, by default, get to be an organic gardener too.
Every permaculture garden is organic, but not every organic garden is permaculture.
Permaculture is overall design, it’s wholistic, systems thinking, closing energy loops, finding multiple functions and maximum yield, creating diversity and resilience through dynamic stability within the system and when you really get into it, it’s much, much more far reaching than growing food.
But growing food is something we all either are doing or want to do.
We all have to eat.
And we want our food to be clean, healthy and full of nutrition. We don’t want to feed our family chemicals, so we grow our food organically.
We want what’s best for our families.
So the added challenge of becoming a skilled and thoughtful organic gardener lies before us.
This post is about one of the key aspects of organic gardening – green manure crops (GMCs).
ABOVE - a newly planted green manure crop just peeping through the mulch.
One of the best resources I know of for information on GMC’s is
Green Harvest – visit their website and read through the (huge amount of) information they have on their website about GMCs, I won’t bore you with too much repetition here, I'll let the experts there fill you in.
You can order GMC packs from them too.
But I will give you a little info... a green manure crop is a mixed crop of legumes, grains and grasses grown specifically for the soil.
You don’t eat it, it’s not for the chooks or the guinea pigs or the worms or the goats or the cows.
It’s for the soil.
ABOVE - our dog Barney sits among the emerging green manure crops in our vegie beds
ABOVE - the same bed a few weeks later - these beds are watered and fed like all the others.
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ABOVE - a little later yet again
ABOVE - once the crop reaches its peak - just before flowering - it's chopped down and covered with mulch. Within a couple of weeks (depending on your unique weather, rainfall, temperature and the microbial life in your soil) all the green material will be gone from beneath the mulch and it will be ready to be planted out.
ABOVE - and a few weeks later again, you'll have healthy new plants growing happily in their enriched soil.
Green manure crops are Soil Food – leafy greens above the soil for extra nitrogen and rich lush root systems below the surface for bulk organic matter.
And you have choices when it comes to GMCs – first choice is whether it’s cool season or warm season. That part’s easy.
Next choice is what you want the GMC to do – do you want it to break up a heavy clay soil, to add nitrogen, break disease cycles, provide organic matter or to get rid of nematodes?
So many choices!
ABOVE - a new garden bed planted out with a GMC - Wooly Pod Vetch and Oats are getting the soil ready for a new perennial garden around a new aquatic plant bathtub. We'll plant ginger, chillies, kaffir lime and other Asian goodies in the beds and kang kong in the water.
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GMC provide a lush cover crop for your soils, smothering weeds and encouraging microbial life below the surface.
You'll find all sorts in here - frogs, beetles, grubs - it's alive!
BELOW - GMC's are part of the overall garden crop rotation system. So you have them among food crops - not all your garden under GMCs at once or you'll have nothing to eat. In the photo below you can see how we have only a strip of this large bed under a green manure crop - it's pretty shaded, but there are cabbages, lettuces, basil and mustard in the bed also.
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And each green manure crop brings it’s own unique qualities and characteristics to the soil. And mixing it up with a wide range of seeds will bring more diversity to the services your GMC will deliver.
We’re using GMCs now to maintain our garden beds over the hot, humid summer here in the subtropics.
They will perform many functions for us – suppress weeds, provide a living mulch, build soil structure, improve soil health, feed microbes and keep the bed biologically active.
GMCs need to be treated like food crops – watered regularly, fed with fertilisers along with the rest of the garden and kept mulched while they grow to ensure you get the very best for your garden.
We’ll cut down our new green manure just before flowering or just before going to seed and they will be the start of some plumped up, well fed beds for autumn plantings.
Happy everything,
Sonya