Also known as
Narrow-leaf knotweed, Northern knotweed, Birdweed, Common knotgrass, Pigweed, Prostrate knotweed and Lowgrass
How to care for American Knotweed
American Knotweed needs 0.5 cups of water every 9 when it doesn’t get direct sunlight and is potted in a 5" pot.
Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.
American Knotweed love being close to bright, sunny windows 😎.
Place it less than 1ft from a south-facing window to maximize the potential for growth.
American Knotweed does not tolerate low-light 🚫.
Select your region to see how the current weather in your area affects the placement of American Knotweed in your home 🏡.
Most potting soils come with ample nutrients which plants use to produce new growth.
By the time your plant has depleted the nutrients in its soil it’s likely grown enough to need a larger pot anyway.
To replenish this plant's nutrients, repot your American Knotweed after it doubles in size or once a year—whichever comes first.