.Does anyone know what’s living in my new/first bonsai? Should I be concerned? Anything I can do?

Paul Broun

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Hi. New to the group. First one. I want to do well. So far so good. I have some new growth.
Seems to be happy, but there is a tenant.?
 

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Gsquared

Shohin
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Looks like it could be worm casting, but there’s a lot of them for a pot that size. Big worm?
 

WNC Bonsai

Omono
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Looks like caterpillar droppings to me. Check your foliage for them or anything that doesn’t look like foliage in case they are in a web. I would suspect sawflies.
 

Wires_Guy_wires

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Caterpillar dropping or snail dropping are usually black in my yard. I think it's just a giant worm that's doing some root work for you.
If the dry droppings turn to sand when crunched between your fingers, it's a worm. If they turn to sawdust, burn the tree. If it's sticky and gooey (and pitch black) when wet, but not sand-like, it's either snails or caterpillars.
 

substratum

Shohin
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What part of the country are you in?
In north Florida we have varieties of wasps that will bore a solitary hole in the ground and leave a little pile of dirt similar to your pic, though the granules in your pile does have a sort of “processed” look like the work of a worm. I never worry about these particular ground wasps because they are not nesting (nesting wasps, I am wary of).
 
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