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|name_ref=Wikipedia
|name_ref=Wikipedia
|habit=herbaceous
|habit=herbaceous
|habit_ref=Flora - A Gardener's Encyclopedia
|Min ht box=40
|Min ht box=40
|Min ht metric=cm
|Min ht metric=cm
|Max ht metric=cm
|Max ht metric=cm
|height_ref=Wikipedia
|height_ref=Wikipedia
|Max wd box=60
|Max wd metric=cm
|width_ref=Flora - A Gardener's Encyclopedia
|poisonous=to some animals
|poisonous=to some animals
|lifespan=annual, biennial
|lifespan=annual, biennial
|water_ref=Plants for a Future
|water_ref=Plants for a Future
|features=evergreen, flowers, naturalizes, invasive
|features=evergreen, flowers, naturalizes, invasive
|flower_season=early summer, mid summer, late summer, early fall
|flower_season=early spring, mid spring, late spring, early summer, mid summer, late summer
|flower_ref=Flora - A Gardener's Encyclopedia
|flowers=blue, purple
|Temp Metric=°F
|Temp Metric=°F
|min_zone=7
|min_zone=7
|usda_ref=Plants for a future
|usda_ref=Plants for a future
|max_zone=10
|image=Milk thistle flowerhead.jpg
|image=Milk thistle flowerhead.jpg
|image_width=240
|image_width=240