Characteristics
Cockleburs are short-day plants, meaning they only initiate flowering when the days are getting shorter in the late summer and fall, typically from July to October in the northern hemisphere. They can also flower in the tropics where the daylength is constant.
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Seedling struggling to take root among the sand dunes of West Texas
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Closeup of fruit, Wilbur Hot Spring, Colusa County, California
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Xanthium strumarium in Pine Creek Canyon, Red Rock Canyon, southern Nevada
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