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Weed Identification in Christmas Trees

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Common eveningprimrose - Oenothera biennis L.
Home > common evening primrose
Life cycle: Usually an erect biennial or winter annual. Occasionally a summer annual.

Leaves: Alternate, narrow oval-shaped, smooth to slightly wavy leaf margins, with distinctive pink to white midveins. Leaves initially develop from a basal rosette.

Stems: Erect, semiwoody, approaching 5 feet in height. Stem usually branches only at the top and may be visible through the winter.

Flowers and fruit: Flowers are yellow, attached to fused sepals forming a tube and found in terminal spikes. Seed capsules are woody, cylinder-shaped and thickest near the bottom.

Reproduction: Seeds.
 
Common eveningprimrose rosette Common eveningprimrose flower Common eveningprimrose plant
Common eveningprimrose rosette. Common eveningprimrose flowering stem. Common eveningprimrose plant.
 
Cutleaf eveningprimrose leaf
Cutleaf eveningprimrose leaf is coarsely toothed.
Similar weeds: Cutleaf eveningprimrose (O. laciniata Hill) Differs by having a prostrate to moderately erect, branching stem; wavy and coarsely toothed leaves; yellow to reddish flowers in the upper and middle leaf axils; and linear, cylinder-shaped seed capsules.

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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02/07/08