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Ahoy there! I laid 3-4 bags of standard sugar cane mulch in the back garden - a couple of inches thick - and 4-5 days later it turned - with dark patches of mould covering the layer. Think there may have only been one little patchy area when I laid it… but I didn’t pay too much attention nor worry. Now it’s been some 4 weeks, and the mould is dominating. Anyways, do you suggest I just spray it with vinegar? Dig it up (with PPE)? Leave it be? Any help would be much appreciated. THanks!
Welcome to the Bunnings Workshop community @rc20e. It's fantastic to have you join us, and many thanks for your question about mouldy sugarcane.
@Marty_greenshed is on the money, and I don't believe this is anything to be concerned about. I also don't believe it is mould (well, not in the context of mould in a bathroom), more so the natural decomposition of the sugarcane. All the sugarcane I've used that's become damp exhibits this same behaviour. As advised, you can turn it over or just leave it be. I'd advise wearing a face mask with any gardening task where dust can be created; this goes for soils, mulches or anything that can have particles become airborne.
There's a lot of discussion on the internet about mould and fungus in mulches. Most of these are on the decomposition process under the mulch at the soil level. If you lay mulch too thick or it's too wet, you'll see a bloom of white fungi and bacteria develop. Once again, this isn't cause for concern and can be managed by aerating the mulch, turning it over, or thinning it out. Fungi play a crucial role in breaking down organic matter and returning nutrients to the soil.
Just to be sure, let me tag in our resident horticultural expert @Noelle to give her thoughts.
Please let me know if you have any questions.
Mitchell
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