That is because it is so wet they come to the top.
I have seen the streets and gutters full of them after a hard rain.
They like food and moisture but not too much.
As long as you keep feeding them they will stay and multiply.
The board idea is good too they like to hang out under boards.
As for plastic dont even think about it for the most part it is a big hassle.
The have roles of thick brown paper at Home Depot at the paint section I use as a mulch or cover.
It is biodegradable and will last one season.
Worth
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