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Weed Identification in Christmas Trees

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Yellow rocket - Barbarea vulgaris R. Br.
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Yellow rocket lower leaf
Yellow rocket lower leaf.
Yellow rocket seedling
Yellow rocket seedling.
Yellow rocket rosette
Yellow rocket rosette.
Life cycle: Erect winter annual or biennial.

Leaves: Seedlings have round to egg-shaped cotyledons on long stalks with smooth, shiny, dark green leaves that initially develop from a basal rosette. Lower leaves are 2 to 8 inches long with a large, rounded terminal lobe and up to four oppositely arranged smaller lobes along the stalk. Upper leaves are alternate, more coarsely toothed than lobed, and they often distinctly clasp the stem, gradually becoming smaller toward the top.

Reproduction: Seeds.

Stems: Erect, hairless and up to 3 feet tall. Stems bolt from a basal rosette to flower and are highly branched at the top.

Flowers and fruit: Bright yellow flowers with four petals are found in terminal clusters. Fruit are slender, slightly curved, approximately 1-inch-long capsules with a slender beak at the tip; fruit are nearly square in cross-section.
Yellow rocket flower
Yellow rocket flowers.
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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02/08/08