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    How to Identify and Avoid Ragweed - The Spruce

    • Ragweed is a plant that many people speak of but might not know for sure what it looks like. It is well known by name because it is the prime source of fall allergies in North America. And it is hard to identify becau… See more

    Varieties

    There are two common varieties of ragweed: common ragweed (Ambrosia artemisiifolia) and giant ragweed (Ambrosia trifida). Together, the two plants account for most of the … See more

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    Morphology

    The leaf of the common ragweed plant is made up of multiple leaflets that have a fern-like appearance. The leaflets are essentially miniature versions of the whole leaf. Such l… See more

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    Appearance

    Another identifying feature on the common ragweed plant appears with its initial leaves, those that first come out after a seed germinates. These typically have some purpl… See more

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    Example

    The image here shows the flower spike of the male flowers of common ragweed. Using a magnifying glass, you would be able to detect the presence of five stamens on each of t… See more

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    How big does ragweed get?
    Giant ragweed can be even taller than six feet tall, and has 3-lobed leaves that are arranged like fingers on a hand (palmate) rather than fern-like leaves (pinnately compound). Common ragweed leaf. Photo by Bruce Ackley, via bugwood.org. Giant ragweed leaves. Leaves can be entire to 5-lobed, but 3-lobed is the most common shape.
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    Table of Contents
    Varieties
    Morphology
    Appearance
    Example
    How big does ragweed get?
     
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