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Pest Information

Tower Mustard

Tower Mustard

  • Latin Name: Arabis Glabra
  • Common Name: Tower Mustard
  • Other Names: Tower rockcress, tower cress

Pest Details

Tower Mustard
Tower Mustard
Tower Mustard
Tower Mustard


Native to North America, where it occurs from Alaska throughout Canada, and in the U.S. in nearly every state with the exception of the southeast states from Texas to South Carolina.


Considered a protected plant in Indiana and Tennessee, this is an annual or short lived perennial that reproduces from seeds. Plants are unusual for mustard plants by their extremely tall and non-branching growth. They may be found along roadsides and in most disturbed habitats.


Mature plants grow to around 6 feet in height with one to several erect stems. Growth begins as with a basal rosette of leaves, and as the stem grows leaves grow alternately along its length. Leaves are lance-shaped and clasping around the stem. The flower head is a small, dense cluster at the end of the stem, with the maturing seed pods forming below as the stem elongates. Flowers are yellowish-white with several dozen small flowers in each cluster. The seed pods are extremely long and narrow, up to 3 inches long and linear, and they lay flat against the stem and pointing upward.

Characteristicts Important to Control:

Control is not needed for this native plant.

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