I’ve used the square ones when I was running 4" Rockwood cubes, and they work great.
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I just watered through them. They did seem a bit hydrophobic at first but the water percolated through i think. The hydrophobia may go away with more waterings
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It is just coco mat I think. There are rolls of it at the grow shop I use.
I use simple coco husks as a mulch topping.
Over, and over, and over!
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Yours will be fine, I was referring to the jute fiber you mentioned …
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I was thinking the same thing from looking at the picture of it.
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