Plant Care Pink Knotweed

Pink Knotweed


Polygonum capitatum

How to care for Pink Knotweed


How often to water your Pink Knotweed

Water needs for Pink Knotweed
0.5 cups
every 9

Pink 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 Seattle, Washington.

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

Calculate water needs of Pink Knotweed

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 Pink Knotweed in Seattle, Washington

Seattle, Washington

23% Very Low

Growing Pink Knotweed in Seattle right now

Light needs for plant Pink Knotweed in Seattle, Washington

Plant growth potential is currently very low 📉

January 17th, 2022

Sunlight intensity as measured by “net radiation” in Seattle is currently very low 📉.

The availability of high quality sunlight in your home impacts ability for plants to thrive and is key in dete…

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Light needs for plant Pink Knotweed in Seattle, Washington

Sunlight will increase by 32% ☀️

January 16th, 2022

Seattle is trending towards greater sunlight intensity!

The amount of sunlight in Seattle is expected to increase by 32% over the next 2 weeks to an average of 6.6 megajoules of energy per m2 per …

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Light needs for plant Pink Knotweed in Seattle, Washington

Daylight will increase by 0.8 hours 📈

January 17th, 2022

This month, Seattle is getting an average of 7.4 hours of clear sky sunlight per day.

Hours of daylight will increase by 9.5% over the next two weeks. Your plants will get 9.2 total hours of dayli…

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Finding light for Pink Knotweed in your home

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

Pink 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 Seattle, Washington ⛅.

Pink Knotweed does not tolerate low-light 🚫.


How to fertilize Pink Knotweed

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

When to repot Pink Knotweed

Nutrient needs for plant Pink Knotweed in Seattle, Washington

Is this a good time of year to repot? No ⏳

January 12th, 2022

The growing potential in Seattle is very low 📉.

Repotting in late fall or winter when the day lengths are shorter can be very stressful for a plant and cause it to go into shock.

It's best to …

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Water Needs
Sunlight Needs

Care Summary for Pink Knotweed

Pink Knotweed

Pink Knotweed

Greg recommends:


0.5 cups every 9 days


< 1ft from a window


Repot after 2x growth

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

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