Oyster Mushroom Report 3 of 4: Second Flush is a Success

Day 1 - first flush of fruit 

One month after I inoculated coffee grounds in a bucket with healthy mycelium, 5 days after I trimmed back undesirable coral growth and gave the bucket more air by using the tent less and moving outside of the drying air-conditioning, I finally spot emergent mushrooms. These are a much healthier shape than the coral growth I saw last week. 

I'm calling this first siting Day 1.

I captured these tiny primorida using a macro lens.

Day 2 - rapid growth using regular iPhone camera lens

Day 2 - rapid growth

Here I'm pointing to the same cluster pictured above.

Day 3 - continued growth

The next day the growth rate slows a bit. 

Day 4 - close to harvest

The ideal shape for picking is just as the caps uncurl and reach upward creating a funnel shape, and before they flatten out too much.

Morning light on thriving oyster mushrooms. By evening they were ready to harvest and it was dark and I was hungry, so there's no picture of me sautéing these with garlic. Yummy.

Day 5 - after the harvest

At the same time the cluster pictured above had grown, I spotted another handful of clusters begin to emerge. I had high hopes that I'd enjoy a series of small flushes. 

I didn't think it would help to keep them inside for any length of time, because the air-conditioning would dry them out and the humidity tent seemed to starve them of oxygen. So I took the bucked outside.  

Unfortunately, the summer heat got extreme, rising to 90 degrees in the midday, and those temps are not most conducive to oysters. My hopes of more culinary delight were dashed as I watched them start to shrivel.

Day 8 - shriveled clusters

Disappointing, to say the least

Day 8 - 2 of 5 clusters - apparent failure to thrive

Day 9 - what next?

This morning, I was thinking about what I could do to coax more activity from the mycelium patch I've created, and look what I found: fresh emergent growth!

Day 9 - white emergent growth appears around the clusters that didn't thrive. 

I'll let you know what happens next week. 

To learn more about why I write sci-fi eco-adventures, and to find out more about my work-in-progress and how writing Mission to Blue Grannus requires my research into fungi and myco-remediation, tap on KHBrower.com.

Oyster Mushroom Report 1 of 4: How to Inoculate Coffee Grounds

Clusters of primordia surfaced yesterday, one month after I first inoculated the substrate of coffee grounds. Here each of the mushrooms is less than .5 centimeters in diameter. Today they're at least twice as large and, if all goes well, they'll continue to grow rapidly.

To inoculate your substrate (in my case coffee grounds, but you can use other growing mediums), the absolutely first thing you need is to secure your oyster mushroom spawn with mycelium running throughout. My spawn and how to knowledge came from Fungi Perfecti. (They are my go-to resource, and I'm simply showing you that anyone can do this.) There are other commercial sources for mushroom spawn, as well.

These are the supplies I used:

• 5 gallon plastic bucket 
• 4-5 pounds of used coffee grounds to use as the substrate/growing medium - free from my local Starbucks, so a very urban/suburban option (Note: If you don't use the grounds right away, you can freeze until you're ready so they don't get skanky.)
• disposable gloves - wear whenever touching the inside of the bucket or any of the spawn or substrate (coffee grounds)
• rubbing alcohol and a clean rag
• oyster mushroom spawn 

Once you have all your supplies, start by preparing the bucket. Drill air holes near the top for air and in the bottom for drainage. (I set the bucket on a large saucer and both atop a stool, so I can easily move my experiment, as needed, to optimum light, temperature, and humidity.) 

The day of inoculation:

1. Sterilize your bucket with soap and water, then a final rinse of rubbing alcohol. (Remember to wear gloves and/or sanitize your hands with the alcohol before touching the clean bucket.)
2. Pasteurize your substrate. (I boiled used coffee grounds in non-chlorinated water for 30 minutes and let cool before pouring into my bucket.) 
3. Mix the coffee grounds with the spawn.

Wait for the mycelium to colonize the bucket. In my case, I saw the first signs of healthy growth in five days.

Wait some more. 

Depending on your results, adjust conditions. In my case, it took a full month from inoculation to seeing mushrooms beginning to fruit. (Last week I showed you what happened when my first flush of oyster mushrooms sprouted in an undesirable coral formation. So, I removed the coral and the plastic humidity tent to provide more oxygen and misted the surface with a diluted hydrogen peroxide solution to treat suspicious, possibly competing green mold.

I'm finally getting good results. Fingers crossed. I'll take pictures every day to record mushroom progress and report next week!

To learn more about why I write sci-fi eco-adventures, and to find out more about my work-in-progress and how writing Mission to Blue Grannus requires my research into fungi and myco-remediation, tap on KHBrower.com.

Oyster Mushroom Report 2 of 4: Overnight Growth is Coral-shaped

Oyster Mushroom Bucket Experiment

This morning I was aghast to find my oyster mushroom bucket experiment and, when successful, culinary treat had grown coral-shaped formations overnight.

My first flush of mushrooms doesn't have enough flesh to make a meal.

Coral-shaped formation--elegant shapes, but undesirable for an oyster mushroom.

This undesirable coral formation has one of two causes:

1. not enough light
2. not enough oxygen; too much carbon dioxide

I've had the oyster mushroom bucket in a western facing bay window, where it gets ample indirect light--ideal for this method of propagation. So, I deduce that the cause is not enough oxygen.

I was using a plastic tent to keep the bucket humid. Though I have ventilation holes and three times a day pull the tent off to let the carbon dioxide escape, I deduce I needed to give the patch more time to air each day.

Oyster Mushroom Bucket -- Out for Fresh Air

The weather is perfect today--70 degrees F and raining--so I took the oyster mushroom bucket to my screened in porch. I plan to trim the coral formations and hope for a second flush of edibles.

Pale Green/Gray Mold
Note: Even the coral doesn't grow here.

Near three of the air holes--where I may have carelessly touched the patch to clear coffee grounds away from the hole--first indications of mold appeared today. This is another undesirable development in my experiment, but easy to correct. In the past, light, regular misting of a mild hydrogen peroxide solution has worked for me.

The three steps I plan to take to encourage a second flush of healthy Oyster mushrooms:

1. give the patch more fresh air
2. trim the coral back to the mycelium
3. spray the green mold with hydrogen peroxide solution 

In my next report, I'll give the steps I took to inoculate coffee ground substrate with the spawn I prepared in a June seminar led by Paul Stamets: Mycelium Running: How Mushrooms Can Save the World.

To learn more about why this author writes sci-fi eco-adventures, and to find out more about her work-in-progress and how writing Mission to Blue Grannus requires her research into fungi and myco-remediation, tap on KHBrower.com.

Thank you, Fungi Perfecti, for supplies, training, and inspiration!

Turkey Tail - After a Summer Storm

Turkey Tail is well-known as a medicinal mushroom, generally beneficial to the immune system and specifically used for cancer treatment. This volunteer emerged here on my back patio five weeks ago.