Good bark is waterproof, thats why trees have it. Bad bark holds water and rots. We often use polystyrene chunks in place of bark, it doesnt rot and harbours less pathogens.
Bark is just a space filler, something for roots to cling too and hold the plant in the pot. Sure in a pot it will hold moisture for a while because the moisture is trapped in the pot on the surface of the bark. Once the waterproofing volatile oils have left the bark, which will happen over time, it will start to hold moisture inside the bark and start to rot.
The smaller the bark pieces, the more surface area there is to hold moisture and less space for air to 'circulate'.
Last edited by SilverShaded; 06-27-2015 at 04:10 AM..
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