Phragmipedium besseae

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Good one. Was told by a grower in Germany though to avoid using the clear pots, because that black scum you see there inside is toxic (he said) to the roots. And the black scum only occurs in the clear pots basically, because of the sunlight getting through. So I have slowly been shifting over to non-clear pots when re-potting.
 
Good one. Was told by a grower in Germany though to avoid using the clear pots, because that black scum you see there inside is toxic (he said) to the roots. And the black scum only occurs in the clear pots basically, because of the sunlight getting through. So I have slowly been shifting over to non-clear pots when re-potting.
Dead algae is toxic? :poke:
 
If something prevents air exchange it can suffocate the roots at the very least, and as it decays it could give off chems that hurt roots


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