Smoke
Ignore-Amus
A good place to start is a hydroponic store. they will have all the stuff necessary to get with the program.
In any place with wet cold winters, akadama (except double brand or kiln fired akadama) will start collapsing/compacting in less than a year. In those conditions, even double brand will have collapsed before 3 years have passed. If you live in a place with dry mild winters, akadama will last long enough to keep your trees healthy between two repottings.
As I live in an agreeably moist zone, I no longer use akadama and switched to baked clay. I got tired of having the bottom third of the pot turn into a compact mass 6 months after repotting.
... for him in California.I think Warren's secret is that rather than having to worry about all of this mess we've been hashing out, he just uses what's tried and true, and concentrates on things like design and actually making believable bonsai.
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... for him in California.
No offense intended but every disciple will profess their teachers recipe.
One thing no one can argue about is there is as many soil recipes as there is locations in the world.
If it is working for you than by all means continue to do so. I never rofess one over the other, always what works for you. Now if you were living in NS that may very well be a different story and should by chance what you are doing is producing better results you will not need to twist my arm.
I use 100% turface for my ponderosa. I don't really like how it dries out so fast on the top layer but deep below, it stays moist for quite sometime, especially in this spring weather. This makes it really hard for me to know when my pine needs water. I may switch to a pumice mix in the future as it seems a bit easier to feel if its wet or not.
Years ago I did a soil test of different straight media the results of which were published in the ABS Journal. It was conducted in a greenhouse using Serissa (well rooted) cuttings over a period of 2 months. The 'control' was in regular potting soil with nothing added, the plants were watered only once a day and were given 12/12 light/dark.
If memory serves--as the plants grew on--the ones in a medium of MVP Turface and other straight gritty mixes went through some of the worst wilt cycles, all eventually died from stress.
The winners were:
1. sifted Pine bark mulch
2. medium Perlite
3. 1/8" Pea gravel
The one in the pine bark had the best root system I've ever seen in my life.
Bob
It never made much sense to me when people said "Oh, well we know more now about soils so this is better than what the Japanese have been doing for hundreds of years".
Yes and that was simply using what was readily available and inexpensive.....I seriously think they would have had a good laugh if told they had to import soil from America to grow bonsai. The "been doing for hundreds of years" argument is a little flawed when you consider they never used wire to style bonsai for hundreds of years, they layered their soil by particle size for hundreds of years, and so on... But you are right, the true test of the soil is the health of the tree.
Root rot is blamed for almost any death of a tree, when in fact it is rare and most will never see the problem at all. With todays fast draining mixes, you simply can not over water. If you are using a proper soil mix, then you can add water from above all day long and just watch it flow out of the bottom drainage holes, never overflowing the rim, how can you possible overwater when all excess water is drained away?
Ingredients vary from person to person, Guy Guidry uses a mix with potting soil, Walter Pall uses a mix with peat, both of these ingredients are proclaimed to be certain death for a bonsai by people on the forums, but you can't argue with the results.
The mix isn't important, only that it matches the care you are able to give, but I have said something like this before.... http://knowledgeofbonsai.org/articles/care/soil-potting-media/the-secret-to-soil-revealed/