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The last couple years we have had golden oysters growing on dead black willow upright and downed logs.
Huge amounts that came in monthly flushes a month apart. Of course they are sensitive to timely harvesting.

There were lots more than we harvested.

Question is: When do these normally start flushing when established. Late April, Early May?

My recollection is early May and early and late June, in three batches.
 

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Did you find any larvae in those shrooms?
I found a flush with similar size caps that was dropping spores and they did have some larvae in them. I'm hoping the same spot produces again this year and I can grab them when they're much younger.
 

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I’ve grabbed a few downed logs from the woods that I knew produced golden oysters, and tried to mimic the conditions they came from. It worked for two years so far. Your timing is about right. Seems to be 3 flushes as early as late April for me and I’m south central MI. Can’t wait to smell some shroomy earthy goodness and ramps wafting through the woods.
 

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Pleurotus citrinopileatus (golden oysters) are not native to Michigan. They were introduced, likely from grow kits being used here. I had never heard of them until a few years ago. I believe they started on the west side of the state and made their way eastward. I have yet to find any in my area of Oakland county. And I see dead elm (one of their hosts) all over my area.
 

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Pleurotus citrinopileatus (golden oysters) are not native to Michigan. They were introduced, likely from grow kits being used here. I had never heard of them until a few years ago. I believe they started on the west side of the state and made their way eastward. I have yet to find any in my area of Oakland county. And I see dead elm (one of their hosts) all over my area.

It's interesting that I see them in these arising on a far back remote area.

And that they specifically were growing on a set of black willow (not a common tree in my opinion) and I have not seen them on dead elms. Of which I have a few. Also have some live elms, but not many half dead elms.

Only other natives I see, perhaps on dead elms are pheasant back mushrooms.

Also, maybe my so called golden oysters are some other variety of mushroom. Golden oysters pictures look a little bit more delicate, but mine are definitely oyster looking and not toxic based on eating them.

?? could be something else native besides specifically Pleurotus citrinopileatus.
 

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It's interesting that I see them in these arising on a far back remote area.

And that they specifically were growing on a set of black willow (not a common tree in my opinion) and I have not seen them on dead elms. Of which I have a few. Also have some live elms, but not many half dead elms.

Only other natives I see, perhaps on dead elms are pheasant back mushrooms.

Also, maybe my so called golden oysters are some other variety of mushroom. Golden oysters pictures look a little bit more delicate, but mine are definitely oyster looking and not toxic based on eating them.

?? could be something else native besides specifically Pleurotus citrinopileatus.
Yours are definitely an oyster of some type. Can't tell from the pictures what type they are.
Never heard of goldens growing on black willow. Not saying they don't, but every golden I have seen posted over the past few years have been growing on dead elms.
Here are a few photos I found of them on elm.
Plant Botany Branch Tree Yellow

Plant Tree Terrestrial plant Natural landscape Trunk

Plant Trunk Tree Wood Natural landscape
 

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It is weird how they just started popping up, and some in pretty desolate spots. But spores will be spores. I’ve been walking around looking for mushrooms for a while and never remembered seeing those even 6 years ago. I have a bunch of dead black willows in our swamp. I’ve seen some golden oysters on those as well as enoki. I found a poplar log last year on state land that had both white and golden oysters growing on it. I wonder if we’ll more goldens spreading over time. Would or are they considered an invasive species, or be detrimental to our native species?
 

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It is weird how they just started popping up, and some in pretty desolate spots. But spores will be spores. I’ve been walking around looking for mushrooms for a while and never remembered seeing those even 6 years ago. I have a bunch of dead black willows in our swamp. I’ve seen some golden oysters on those as well as enoki. I found a poplar log last year on state land that had both white and golden oysters growing on it. I wonder if we’ll more goldens spreading over time. Would or are they considered an invasive species, or be detrimental to our native species?
They are already considered invasive. They are spreading fast.
I was going to paste a link to an article about it, bit it will not let me paste. Google "golden oysters invasive" and there are lots of articles about it.

Here is a screenshot from iNaturalist show were people have documented them in Michigan.
Ecoregion Map World Line Parallel
 
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