What type of soil should I use for my Common Knotweed?

Common Knotweed is very sensitive to dry soil, so choose a potting soil that retains moisture . A good soil will still drain well and contain lots of organic matter such as coco coir or sphagnum moss.

Should I fertilize my Common Knotweed?

Common Knotweed grows very slowly and doesn’t require added fertilizer . Replacing your plant’s potting soil once a year should provide them with more than enough nutrition. Remember, plants get their energy from sunlight, not fertilizer!

Can Common Knotweed be grown outdoors?

USDA Hardiness Zone Common Knotweed can be grown outdoors in USDA Hardiness Zones 4a-8b . Find your local hardiness zone here .

Common Knotweed

Q: How often should I water my Common Knotweed?

Common Knotweed prefers for the soil to dry out between waterings and should be watered regularly . Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Q: How much sunlight does my Common Knotweed need?

Common Knotweed requires abundant, bright and direct light. Place it less than one foot from a window to ensure it receives enough light to survive 💪. Select your region to see how the current weather in your area affects the placement in your home 🏡.

Also known as

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

Taxonomy

Scientific name

Polygonum arenastrum

Genus

Polygonum

Family

Polygonaceae

Order

Caryophyllales

How to care for Common Knotweed

Water

How often to water your Common Knotweed

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 Denver, Colorado.

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
9

Does your plant get direct sunlight?

No Yes

Select the pot size

Light

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.

Denver, Colorado

49% Low

Finding light for Common Knotweed in your home

Light needs and placement for plant Common Knotweed: 1ft 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 Denver, Colorado ⛅.

Common Knotweed does not tolerate low-light 🚫.

Nutrients