Upper Arkansas Cooperative Weed Management Area
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Weed of the month submitted by Larry Walker
Elongated Mustard


Elongated Mustard (Brassica elongata) is a biennial plant native to Eastern Europe. It is widespread in some counties of Colorado; yet, fortunately, not reported in others. It's also known as Long-staked Rape.

Many western species in the mustard family bear similar fruit and flowers, but the lance-shaped leaves of the Elongated Mustard differentiate it from other species. Distinguishing characteristics include--

*  Yellow flowers with four petals and six stamens
*  Blooms from June through July
*  Fruits are "siliques" that can be 1.5 inches long with a stalk-
   like base and a seedless, narrow beak.
*  Basal leaves are lance-shaped and weakly lobed, while stem
   leaves are much smaller and do not clasp the stem
*  Can grow up to 3 feet tall
*  Reproduces by seed in late summer or early fall; cold
    temperatures restrict germination and the spread of its
    invasion

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Elongated Mustard Fact Sheet

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