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Originally Posted by ewcia1028
Hello,they say that this New Zealand bark is steamed bark and that's why is so good and should last for 3 years 
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Only 3 years? As Undergrounder said, Pinus radiata bark has been used for growing orchids in Australia and New Zealand for decades, although instead of using "calcium/magnesium buffering" we use a much less grandiose technique called "throw a handful of dolomite in the pot".
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The typical graded, partially composted pine bark that is normally sold here (which Orchiata criticises) lasts for about 3 years. For the amount of effort they put into selling the wonders of their aging process, I would have thought they'd get more life out of their product.
Does the bark that is currently available in the use break down before 3 years? According to some of the older orchid growers I know, American fir bark used to be very highly regarded in Australia and considered of higher quality than radiata pine bark!
FWIW, a lot of Australian growers are now switching from pine bark based mixes to 100% CHC or CHC:bark based mixes. It seems odd that you're thinking about using an old standard Australasian potting mix while we're trying to play catch up to you.
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