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Potting Soil Ingredients

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Old 25-Nov-2002   #1
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Potting Soil Ingredients

I have read in lots of places things like:

70% sifted THIS, 20% graded THAT, 10% plain WHATEVER.

The trouble is, sharp sand varies in composition, akadama varies in grain sizes, John Innes #3 varies in content depending on who supplies it, and so on.

I have recently begun sorting all my ingredients out and sifting them all, so that I could start repotting next year following some sort of system, rather than just bunging handfuls of ingredients together until it looks sorta right.

Pictures elsewhere on the net and in books/mags all show little piles of ingredients, but NOT TO SCALE!! what is the point of having nice clear pictures if there is nothing to use to scale them

So, I will post a series of photos of all the ingredients I currently have, all graded from fine to medium to coarse, with something for scale.

What I want to know is, which of these (if any) matches any of your stuff, and what sizes do you use for different size bonsai. I already have a pretty clear idea in MY mind , but it would help me to know I'm right (or wrong) if I had some feedback.

Thankyou.

Regards,

TB
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Old 25-Nov-2002   #2
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AKADAMA

plain akadama: dust, medium, coarse.
Attached Images
File Type: jpg akadama.jpg (65.1 KB, 535 views)
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Old 25-Nov-2002   #3
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SHARP SAND

Sharp builder's sand: fine, medium coarse.

(I know builder's sand needs washing... )
Attached Images
File Type: jpg sharp sand.jpg (59.9 KB, 532 views)
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Old 25-Nov-2002   #4
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'PROPER' BONSAI GRIT

Washed grit advertised as bonsai 'top dressing' ( ): fine, medium, coarse.
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File Type: jpg gravel.jpg (60.2 KB, 527 views)
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Old 25-Nov-2002   #5
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JOHN INNES #3

Finally the organic component, John Innes #3, as supplied by B&Q in the UK: fine, medium, coarse.
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File Type: jpg john innes 3.jpg (66.4 KB, 527 views)
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Old 25-Nov-2002   #6
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The sieves I have at the moment are not exactly efficient...took about an hour to sieve these quantities... also some big stuff may have crept into the wrong bags... ... you get the picture though...

Regards,

TB
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Old 25-Nov-2002   #7
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Hi there, as you know I am not an expert. I make my soil from items the size of the medium or middle bag in each f your groups. I would use the akadama and the grit as well as an organic element the same size as them both. I use the same three items in my soil, I just adjust the percentage of each for the type of tree... to be honest I do not know if I am correct, but my trees seem to like it!

Or simple put.... I have killed my share of trees, non from the soil mix I use!
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Old 25-Nov-2002   #8
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TB, Jay
I would also use the middle size in my 5mm orchid bark and Haydite. My mix is 6 parts orchid bark, 4 parts haydite and 1 part coprapeat. The peat is obvioulsy the finest particle in the mix. I have not loat a tree with this mix. Wish I knew about it when I first started then I wouldn't have lost so many trees.

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Old 25-Nov-2002   #9
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TB:

I use Hadite in about the size in your middle bags as well. I mix mine only with peat moss 50/50 for all but the large trees. I then have to watch the fertilizing which I do every two weeks with a 20-20-20 water soluble type. For the larger trees I use a little larger particle with 1/3 each of hadite, peat and pine bark. It REALLY drains well. So far everything has thrived on the mixes.

Oh, I also augment the watering with Superthrive which really helps as well.

I think there are as many soil recipes as there are bonsai folks to be honest. Whatever works for you is the best mix I think.
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Old 25-Nov-2002   #10
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Soil mixes

Jay; no offense taken. I believe that specific questions deserve specific answers. As to bonsai mixes I have found that it is most importiant to have about 70%inorganic and 30% good organic materials. There are almost as many diffrent recipies as there are bonsai artests. Personally I am spoiled as I always have sufficent soil for any potting project that may come up.

Glenn
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