Quote:
Originally Posted by daddydoall
The polyester fiber is hydrophobic and seems to repel roots and organic growth (hence its utility in outdoor cushions) when I tried it.
Rock wool is hydrophilic quickly takes on algae growth and roots grow into it.
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I bought a bag intended for stuffing pillows and used it as a pad under a Schomburgkia seedling mounted on a branch. It does retain some water. I would think a mass of even hydrophobic filaments would retain some water due to water's surface tension.
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