Q.a sweet bay plant
They seem to be growing and getting new leaves; however some o the older leaves have these black lines on the underside of the leaves. I asked at the nursery and they said it was not a bug but didn’t know what caused it. Do you have any answers?

Downtoearthdigs
Answered on July 18, 2017
Difficult to say without seeing the marking on your plant.
This link may help you identify the issue.
https://www.gardeningknowhow.com/edible/herbs/bay/sweet-bay-leaf-spots.htm
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