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 Portland, Oregon.

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 Portland, Oregon

Portland, Oregon

26% Very Low

Growing Pink Knotweed in Portland right now

Light needs for plant Pink Knotweed in Portland, Oregon

Plant growth potential is currently very low 📉

January 23rd, 2022

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

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

Read more

Light needs for plant Pink Knotweed in Portland, Oregon

Sunlight will increase by 40.3% ☀️

January 24th, 2022

Portland is trending towards greater sunlight intensity!

The amount of sunlight in Portland is expected to increase by 40.3% over the next 2 weeks to an average of 7.9 megajoules of energy per m2

Read more

Light needs for plant Pink Knotweed in Portland, Oregon

Daylight will increase by 1.0 hours 📈

January 23rd, 2022

This month, Portland is getting an average of 7.3 hours of clear sky sunlight per day.

Hours of daylight will increase by 11.9% over the next two weeks. Your plants will get 9.7 total hours of day…

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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 Portland, Oregon ⛅.

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.

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

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