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OfflineMyco Mystic
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Registered: 08/03/24
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Coffee grounds in Bulk Substrate
    #28901482 - 08/05/24 08:00 PM (5 months, 9 days ago)

Hello,

I'm new to the forum.  And just getting re-started with cultivating again. Any advice is welcome and appreciated.

A few years ago I made the jump from the PF Tek to bulk grows. I was growing some PE and remember having good results with adding spent coffee grounds to my bulk hpoo/coco coir/ verm/ gypsum bulk substrate.  Now my memory has faded and so I have three questions:

1). Is it best to PC sterilize the coffee grounds separately before adding them to the substrate mixture, which will then get pasteurized?  Or is pasteurizing the substrate mixture good enough for the coffee grounds regarding any potential contamination?

2). If I add coffee grounds, should I also add some calcium carbonate for PH buffering?  I'm not sure if the gypsum (10%) is sufficient PH buffering?

3). What is a good ratio for coffee grounds in my hpoo/ coir/ verm substrate?

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OfflinehamloafM
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Re: Coffee grounds in Bulk Substrate [Re: Myco Mystic] * 1
    #28901497 - 08/05/24 08:22 PM (5 months, 9 days ago)

1, No.  spent coffee grounds for bulk substrates.
2, No.  adjusting the ph will not be good for the mycelium.  Gypsum is not a buffer.
3, 1-3%

With that being said, for cubensis we use a high enough spawn to bulk ratio that you can forget about the addition of spent coffee grounds.


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Offlinenaturesnordix
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Registered: 07/07/24
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Re: Coffee grounds in Bulk Substrate [Re: hamloaf]
    #28901734 - 08/06/24 05:07 AM (5 months, 8 days ago)

I prefer a 50%-50% sub to spawn ratio, faster colonization, my 1 to 3 ratio took a month longer to fully colonise when the 50-50 took 2 weeks to fruiting and the 1 to 3 took 1 and a 1/2 months to just fully colonise then another month to pin, not even fruit so .... Tbh I was probably a 1/4 ratio because I forgot to add a pseudo caseing ....

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Offlinenaturesnordix
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Registered: 07/07/24
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Re: Coffee grounds in Bulk Substrate [Re: naturesnordix]
    #28901739 - 08/06/24 05:16 AM (5 months, 8 days ago)

I don't use coffee grounds at all now, I use 100% corn, a special type of purple purvian corn that the native long distance runners in the Andies drink to do their ultra marathon, it's wwwwaaaayyyyyy different then regular corn, you break open the kernel and it looks like it's filled with drywall, like a white powder compressed into kernals, you only need a quality grain, any grain brown rice, barley, quinoa, corn, wheat, ect you can mix a bunch together, depending on the grain you may want to add flaxseeds to make sure your little guys have a complete protein and fat to use, mushrooms are heterotrophic so they surround then breakdown and absorb their nutrition, make sure you get organic spawn material, I PC for 1:30 hours at 15psi then add more water and do another 45-1:30 PC, with rice or small grains you probably only need 1 cycle of the PC but with corn I found u need to sterilize it REALLY GOOD or you will have some issues, corn at least for me only takes 2-4 weeks tops to colonise a full myco quart with a break and shake at 25% and 50%

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OfflineRockinRobot
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Registered: 12/08/22
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Re: Coffee grounds in Bulk Substrate [Re: naturesnordix] * 1
    #28901742 - 08/06/24 05:29 AM (5 months, 8 days ago)

If you're growing cubes you don't need anything but Coir for substrate. No gypsum no Ph balancing needed.

1:2 ratio for questionable spawn / 1:3 to 1:6 for clean spawn.

I usually use 1:3 for my shoebox grows.

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