Its stems are erect , branched in the upper section , and can grow to 1 m high .
Perforate St John 's wort is a herbaceous perennial plant with extensive , creeping rhizomes .
Perforate St John 's wort 's stems are erect , branched in the upper section , and can grow to 1 m high .
Perforate St John 's wort is a herbaceous perennial plant with extensive , creeping rhizomes .