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Weed Identification in Christmas Trees

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Common milkweed - Asclepias syriaca L.
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Common milkweed young plant Common milkweed flower
Common milkweed flower clusters.
Common milkweed leaf
Young common milkweed plant. Common milkweed leaf.
Common milkweed fruit
Common milkweed fruit.
Life cycle: Stoutly erect, patch-forming perennial.

Leaves
: Opposite, oval, oblong to egg-shaped leaves are 3 to 8 inches long with smooth margins and distinctly white midveins and veins. The upper leaf surface is dark green and usually smooth; the lower leaf surface is pale green and finely hairy. Leaves exude a milky sap when damaged.

Stems
: Stout and erect, rarely branched, up to 6-foot-tall herbaceous stems are finely hairy and hollow and exude a milky sap when damaged.

Flowers and fruit
: Purple, pink to white flowers are found in dense, ball-like clusters consisting of 20 to 130 individual flowers. Fruit are large, 3- to 5-inch-long, grayish green, teardrop-shaped pods covered with soft, warty bumps. Pods split open at maturity to release thin, brown, oval seeds each with a tuft of long, silky hairs that aid in wind dissemination.

Reproduction
: Seeds, creeping roots and rhizomes.
Common milkweed mature fruit
Common milkweed mature fruit.
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