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OfflineWoolyMarmot
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Registered: 06/01/20
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Max percentage of spent coffee in substrate?
    #26900013 - 08/26/20 07:01 AM (3 years, 5 months ago)

I want to make use of the throw-away spent grounds the coffee shops near me are willing to give me. From what I've seen people can go 100% spent coffee grounds with oyster mushroom culture but how much can cubensis tolerate? I've been reading that they are contam-prone, which I don't understand since coffee is naturally acidic


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InvisiblefahtsterM
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Re: Max percentage of spent coffee in substrate? [Re: WoolyMarmot]
    #26900059 - 08/26/20 07:49 AM (3 years, 5 months ago)

If you haven’t experienced it in everyday life, you should try leaving out your own spent grounds after you make coffee one day and see how long it takes for mold to grow.  It’s usually after only 3 days IME.  This means that if you have exposed coffee grounds in a substrate for longer than that, you’ll end up with a contaminated tub... especially at any time during the summer.  So the benefit coffee grounds add to a substrate is really out-weighed by the risk that the tub will end up shitting out on ya.  It can definitely be done, but you’ll want to use more grain spawn than you you would without them grounds.  While I’m all about experimenting, I wouldn’t put all my eggs in that one basket.

A much better practice is to add actual liquid coffee to the water you use to hydrate your grains.. the grains are pressure cooked and sealed until all the grain is colonized so you don’t have to worry about beating anything out and you still get the benefit of the coffee, which in my experience is a faster more aggressive colonization time.  You can definitely over do it going that route too.. I found a pretty light amount of liquid coffee to work well.

Faht


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InvisibleFunky Monkey
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Re: Max percentage of spent coffee in substrate? [Re: fahtster]
    #26900190 - 08/26/20 09:43 AM (3 years, 5 months ago)

Quote:

fahtster said:
A much better practice is to add actual liquid coffee to the water you use to hydrate your grains.. the grains are pressure cooked and sealed until all the grain is colonized so you don’t have to worry about beating anything out and you still get the benefit of the coffee...  You can definitely over do it going that route too.. I found a pretty light amount of liquid coffee to work well.




Now that I think about it... Maybe this has been a problem for some of my bad bags in the past...

Next time I will have my spiffy new flowhood, and I am going to go the purist route of straight coir and spawn and once I get consistent clean results with the flowhood rather than fumbling around an SAB with multiple bags, I will slowly add things to the mix, like trying a smaller amount of coffee etc. I used to get a little excited with how much coffee I poured into my soak water and maybe that was a problem.

Thx for making me think about this faht


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OfflineMartinsapin
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Re: Max percentage of spent coffee in substrate? [Re: Funky Monkey]
    #26901960 - 08/27/20 09:35 AM (3 years, 5 months ago)

I dont know the max.

I put some of my spent morning coffee with my oats when I boil them.


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InvisiblePastywhyteMDiscord
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Re: Max percentage of spent coffee in substrate? [Re: fahtster]
    #26901969 - 08/27/20 09:40 AM (3 years, 5 months ago)

Quote:

fahtster said:
If you haven’t experienced it in everyday life, you should try leaving out your own spent grounds after you make coffee one day and see how long it takes for mold to grow.  It’s usually after only 3 days IME.  This means that if you have exposed coffee grounds in a substrate for longer than that, you’ll end up with a contaminated tub... especially at any time during the summer.  So the benefit coffee grounds add to a substrate is really out-weighed by the risk that the tub will end up shitting out on ya.  It can definitely be done, but you’ll want to use more grain spawn than you you would without them grounds.  While I’m all about experimenting, I wouldn’t put all my eggs in that one basket.

A much better practice is to add actual liquid coffee to the water you use to hydrate your grains.. the grains are pressure cooked and sealed until all the grain is colonized so you don’t have to worry about beating anything out and you still get the benefit of the coffee, which in my experience is a faster more aggressive colonization time.  You can definitely over do it going that route too.. I found a pretty light amount of liquid coffee to work well.

Faht




This


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