![]() Once the bag is completely white with mycelium (sometimes this takes longer than 4 weeks) remove the bag and place in a humid environment.Store the bag in a dark and warm place (around 18-24☌) for 10-21 days. Avoid the temptation to regularly check on them – they like to be left alone at this stage.Pierce the bag with 2-3 pin holes to allow air exchange during colonisation.Add the mix to a sealable plastic bag (leaving some air in the bag before sealing, as you did with your cardboard spawn prep bag).A ratio of 1:10, spawn to straw is ideal. Add your prepared and cultivated spawn.Drain off the straw and wait for it to cool to room temperature.Be careful not to boil the straw as this will remove key nutrients. Pasteurise your straw by soaking it in water at a temperature of 72☌ – 82☌ for 40 minutes to 1 hour.Take your straw and cut into short lengths to maximise surface area, approximately 1-2 inches.Once the cardboard has gone entirely white, it is ready to use as spawn, you can add this to straw to “bulk-up” and grow from with the below process.ġ0 Basic Steps for Cultivating Mushrooms on Straw The less they are disturbed the quicker they will grow. Store the bag in a warm (ideally around 23☌) dark place and leave for at least 3-4 weeks.When sealing the bag there's no need to squeeze out all of the air from the bag – oxygen is good! Repeat steps 6 and 7 until the container/bag is filled and finish by adding a final layer of cardboard with no mushroom on the top.Cover the mushroom stems with another layer of cardboard.Add 3 - 4 small pieces of mushroom, preferably the stem butts, to the sheet of card – less is more and will help the mycelium grow stronger.Place an even layer of your pasteurised cardboard on the bottom of the container / bag.Next, you'll need a clean food container or bag. Make some pin sized holes in it for air exchange.This step is important to minimise contamination risk! Wait 6 – 10 mins and once the cardboard is cool enough to touch separate the layers of card.Pasteurise the cardboard by pouring freshly boiled water over it. Let it cool, and pour off the excess water.You'll need large pieces that you can cut or shred into smaller pieces. Source cardboard with no ink or writing on it.If you already have your cardboard spawn bag ready, skip to step 10! You can try the cardboard technique with any wood-loving mushroom, from the supermarket, forest, or previous grows – experiment! (But don’t mix types) As cardboard has little nutrients you won’t get mushrooms from this, but the results of this process can be added to straw, which you can mushrooms grow from. A spawn bank is anything that has mycelium present, making it perfect for growing mushrooms. This process will allow you to create a “spawn bank”. 10 Basic Steps for Making Your Own Mushroom Spawn
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