Combined Spawn/Bulk Kits

Dank Mushrooms
2 min readMay 3, 2023

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I’m trying my hand at making a grow bag that has both spawn grain and bulk substrate included in the same bag. The idea is to remove the exposure that occurs during the second inoculation (from spawn to bulk) from the process. To this end, I have created the following bags:

Masters Mix with Wild Bird Seed (WBS)
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1.25 lbs WBS
4.25 lbs Masters Mix

Coco Coir with Wild Bird Seed
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2.5 lbs WBS
3.25 lbs Coco Coir

Manure/Coco Coir with Wild Bird Seed
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2.5 lbs WBS
3.25 lbs Manure/Coco Coir

The Coco Coir recipe I am currently using is:

Coco Coir/Vermiculite (7.5 lbs)

1 block (650 gram) coco coir
8 cups vermiculite
2 cups peat moss
.5 cups worm castings
.25 cups calcium carbonate
16 cups water

To add Manure to the recipe I simply add the following to double the yield to 15 lbs:

16 cups horse manure
.5 cups Gypsum
4 cups water

For this first round, I have used the larger bags for the masters mix

Combination spawn/bulk bag with masters mix

and the longer bags for the coir-based substrates.

Combination spawn/bulk bag with coco coir

Each bag is sterilized and sealed. The inoculation port is at the top of the bag so that the spawn may be easily reached.

Inoculating combination bag, liquid culture and WBS spawn bags

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Dank Mushrooms
Dank Mushrooms

Written by Dank Mushrooms

Dank Mushrooms offers delivery and shipment of fresh gourmet and specialty mushrooms, dried mushrooms, mushroom supplements, grow kits and mycology supplies.