What do I do to get rid of it? It's at the base of all my ornamental grasses on a drip system. On two different occasions I left system on manual for over 5 hours by mistake. Looks like someone dumped an ashtray into my flax. File won't upload on my iPad.
Mold due to overwatering?
If it is mold and not algae, you might spray it with a diluted bleach solution.
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