Plant Care Dune Knotweed

Dune Knotweed

About Dune Knotweed

Dune Knotweed is a super rare houseplant 🌿 that needs regular watering to thrive. They do best in long-lasting, direct light ☀️ and should be less than 1 foot from a window.

Dune Knotweed likes soil that is good at retaining moisture. Your plant shouldn't need added fertilizers if you repot each time it doubles in size.


Polygonum paronychia

Also known as

dune knotweed, black knotweed and beach knotweed

How to care for Dune Knotweed


How often to water your Dune Knotweed

Water needs for Dune Knotweed
0.5 cups
every 9

Dune 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.

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.

Select a city to check sunlight intensity

Finding light for Dune Knotweed in your home

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

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

Place it less than 1ft from a south-facing window to maximize the potential for growth.

Dune Knotweed does not tolerate low-light 🚫.

Select your region to see how the current weather in your area affects the placement of Dune Knotweed in your home 🏡.


How to fertilize Dune Knotweed

Nutrient, fertilizer, and repotting needs for Dune 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 Dune Knotweed after it doubles in size or once a year—whichever comes first.

Water Needs
Sunlight Needs
Growth Pattern

Care Summary for Dune Knotweed

Dune Knotweed

Greg recommends:


0.5 cups every 9 days


< 1ft from a window


Repot after 2x growth

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

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