Great globe thistles are stalwart perennials that produce metallic-blue blossoms with perfectly round flower heads atop ribbed stems. Plants grow two to five feet tall and almost as wide. The spiny-edged leaves are white and woolly underneath.
This thistle appears yearly in the back yard and it shocked me the first time I saw something so eye-catching off of a common weed.
Photo captured July 28, 2010.
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