Douglas's Knotweed (Polygonum Douglasii) is a annual herb in the Polygonaceae family with easy care difficulty. It requires moderate watering and full sun or partial shade light in USDA hardiness zones 4-8. This plant is safe for cats and dogs.

Polygonum douglasii is a slender annual herb known as Douglas's knotweed, native to northern and western North America.

Douglas's Knotweed

Douglas's Knotweed

Polygonum Douglasii

Polygonum douglasii is a slender annual herb known as Douglas's knotweed, native to northern and western North America.

Quick Facts

Type
herb
Lifecycle
annual
Care Difficulty
Easy
Water Needs
Moderate
Light
Full Sun, Partial Shade
Hardiness Zones
4-8

Safety

🐕
Pet Safe
👶
Child Safe
Non-Toxic

Growing Conditions

Soil Types:sandy, loamy, rocky
Indoor:No
Outdoor:Yes
Garden Use:groundcover, pollinator support, erosion control

Care Calendar

Monthly care tasks for Douglas's Knotweed

Jan
Prune
Feb
Fertilize
Mar
Repot
Apr
Water+
May
...
Jun
...
Jul
...
Aug
...
Sep
...
Oct
...
Nov
...
Dec
...

Expert Care Tips

Pro tips from botanists and plant experts

Watering Tip

Check soil moisture by inserting your finger 1 inch deep. Water only when the top layer feels dry to prevent overwatering.

Humidity Trick

Group plants together to create...

Growth Hack

Rotate your plant every...

Photo Gallery10+ photos

Douglas's Knotweed
Douglas's Knotweed detail

View leaf details, flowers, seeds & more in the app

Taxonomy

Family:Polygonaceae
Genus:Polygonum