Tutsan (Hypercum androaemum) and St.John's Wort (Hypericum perforatum) are common weeds of waste places. St John's Wort can be toxic to animals.
Hypericum weeds include Tutsan and St. John's Wort.
St. John's wort is a hairless erect woody weed up to a metre tall with clusters of yellow flowers. Tutsan looks similar but grows to 1.5 metres.
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