Canada Thistle (Cirsium arvense) Cirsium arvense

Why Like Invasive plant with painful spines spreads quickly in disturbed areas via cotton-like seeds as well as lateral roots spreading as far as 20 feet from the parent. It does have pretty purple flowers.
Description

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Plant Data
I am a... Deciduous Perennial
Flower Color
   In the Landscape Focused on the Plant Leaves Flowers Fruit Fall Leaf Winter Form
 
 

Photos: Google Image Search & Flickr

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