Perhaps I am clueless. How are you using a systemic with bark medium? I've used it as granular "Marathon" in potting soil, and I've used it as a soil drench for Emerald Ash borer etc. But, what is your method for bark?
The research I read for outdoor culture stopped my using it because it was proven to harm honeybees and butterflies.
This is a matter best left up to the individual grower. What does your conscience say? Are you indoor or outdoor etc. We collect opinions and make the best informed decision we can within our parameters.
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