Question: Hello, these weeds are growing in the lawn of one of my clients. It is located on Cape Cod. I …
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Question
Hello, these weeds are growing in the lawn of one of my clients. It is located on Cape Cod. I thought it was black mustard, Brassica nigra but the more I look at it, the less confident I am of my ID. Any help would be appreciated.
Answer
Dear Tim1127, this plant looks like a species of Barbarea (yellow rocket). It is most likely Barbarea vulgaris, a very common, early spring flowering mustard with yellow flowers and pinnately compound leaves. It occurs in a variety of habitats, including lawns.
