Why does my mint turn black?

Asked May 24, 2020, 1:11 PM EDT

Every year my lovely stand of mint starts turning black. What's going on? -Leif Neve

Montgomery County Maryland

1 Response

Hi- we think this might be fourlined plant bug feeding which is very common this time of year:
https://extension.umd.edu/hgic/topics/herb-problems
https://hortnews.extension.iastate.edu/fourlined-plant-bug

Prune out the damaged leaves. No control is recommended. It's a temporary problem. Next year, you could try covering your plants with a floating row cover to exclude this pest:
https://extension.umd.edu/hgic/topics/floating-row-cover
Jon