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A guide to nonnative invasive plants inventoried in the north by ...

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Polygonum sachal<strong>in</strong>ense<br />

Giant knotweed POSA4<br />

Form: S<strong>to</strong>ut perennial plant 3-16 ft (1-5 m) tall.<br />

Leaves: Alternate, petiolate, petioles ½-1½ <strong>in</strong>. (1-4 cm)<br />

long; blade 6-12 <strong>in</strong>. (15-30 cm) long and 3-10 <strong>in</strong>. (7-25<br />

cm) wide, ovate-oblong, with an obtuse <strong>to</strong> acute apex and<br />

cordate base, lower surface with short

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