Hi all,
Thanks to all that replied.
To Aaron J. Hicks:
Have you found the bleach concentration that should be applied?
To Peter O'Byrne:
Yes Peter, the black thing does match your description. What do you have in mind?
To Oliver Sparrow:
No, Oliver, it does not behave like this. It only develops at the base of the plants and on the compost surface and on the pot. It seems to like a humid environment
Gerard,
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