Plant Care Common Knotweed

Common Knotweed

Also known as

Common knotweed, equal-leaved knotgrass, prostrate knotweed, mat grass, oval-leaf knotweed, stone grass, wiregrass and door weed


Polygonum arenastrum

How to care for Common Knotweed


How often to water your Common Knotweed

Water needs for Common Knotweed
0.5 cups
every 9

Common Knotweed needs 0.5 cups of water every 9 when it doesn’t get direct sunlight and is potted in a 5" pot located in Dallas, Texas.

Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Water 0.5 cups every

Does your plant get direct sunlight?

Select the pot size


Check the growing potential in your area

A plant's growing potential is determined from its location, the time of year, and current local weather.

Plant care guide for Common Knotweed in Dallas, Texas

Dallas, Texas

54% Low

Finding light for Common Knotweed in your home

Light needs and placement for plant Common Knotweed: 1ft from a window
1ft or less from
a window

Common Knotweed love being close to bright, sunny windows 😎.

Place it less than 1ft from a south-facing window to ensure it receives enough light to survive during this time of reduced sunlight intensity in Dallas, Texas ⛅.

Common Knotweed does not tolerate low-light 🚫.


How to fertilize Common Knotweed

Nutrient, fertilizer, and repotting needs for Common Knotweed: repot after 2X growth

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 Common Knotweed after it doubles in size or once a year—whichever comes first.

Water Needs
Sunlight Needs
Growing Outdoors

Care Summary for Common Knotweed

Common Knotweed

Greg recommends:


0.5 cups every 9 days


< 1ft from a window


Repot after 2x growth

Based on your location in Dallas, Texas, the 4” pot your plant is in, and that it doesn’t get direct sunlight.

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