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The Corroboree

Pots - Is this mould and is it a problem?


AbleKay

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possibly a dumb question but I'm game, assuming that not all moulds are bad for plant roots should I ignore this black stuff or give them a clean? i'd prefer to keep the pots chemical free is all, but don't want to harm my plants either so any recommendations (bicarb?) appreciated. thanks

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The mould is most likely harmless, but it's good practice start with clean pots so you don't transfer any pathogens to the next plant that will go into that pot.

Acidified bleach kills almost everything - much more than straight bleach ever will. Mix 1 cup bleach & 1 cup of vinegar into 4 litres of water and scrub it with that. Wear rubber gloves and make sure you rinse off all the residue.

It will outgas some nasty shit, so do it outside and don't breathe it in.

Edited by Sally
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The mould is most likely harmless...

that's all i wanted to hear

they're new pots, just been sitting outside unused for 5 years so thought probably harmless to soil, plants kinda maybe.

...might just enlargen the drainage hole and spray with peroxide as suggested. that sounds like the easy way out

thanks all

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You could try using a soil that is purely mineral and dries out faster. This type of stuff can only grow when the soil stay wet for a while. It´s definitely mold and I´d be more concerned about breathing it than it damaging the cacti. Most cacti will have no problem with this. But it´s not really healthy to keep moldy stuff around. So maybe dont bring it inside over winter.

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Introduce Trichoderma and you'll have no worries. I've started using that on all my plants and that fungi is amazing at keeping the stress of plants down and helps remove harmful pathogens.
Look into 'Rape cakes'. Rape seed based.

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