Plant Care Black Swallow-Wort

Black Swallow-Wort

Also known as

Louise's swallow-wort, Louise's swallow-wort, Black swllowwort, Black swallow-wort and Black dog-strangling vine


Vincetoxicum nigrum

How to care for Black Swallow-Wort


How often to water your Black Swallow-Wort

Water needs for Black Swallow-Wort
0.5 cups
every 9

Black Swallow-Wort needs 0.5 cups of water every 9 when it doesn’t get direct sunlight and is potted in a 5" pot located in Pittsburgh, Pennsylvania.

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 Black Swallow-Wort

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 Black Swallow-Wort in Pittsburgh, Pennsylvania

Pittsburgh, Pennsylvania

41% Low

Growing Black Swallow-Wort in Pittsburgh right now

Light needs for plant Black Swallow-Wort in Pittsburgh, Pennsylvania

Plant growth potential is currently very low 📉

December 1st, 2021

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

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

Read more

Light needs for plant Black Swallow-Wort in Pittsburgh, Pennsylvania

Sunlight intensity will decrease by 30.3% ☀️

November 29th, 2021

Pittsburgh is trending towards lower sunlight intensity!

The amount of sunlight in Pittsburgh is expected to decrease by 30.3% over the next 2 weeks to an average of 6.5 megajoules of energy per m…

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Light needs for plant Black Swallow-Wort in Pittsburgh, Pennsylvania

Daylight will decrease by 1.1 hours 📉

November 30th, 2021

This month, Pittsburgh is getting an average of 7.7 hours of clear sky sunlight per day.

Hours of daylight will decrease by 11.1% over the next two weeks. Your plants will get 9.1 total hours of d…

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Finding light for Louise's swallow-wort in your home

Light needs and placement for plant Black Swallow-Wort: 1ft from a window
1ft or less from
a window

Black Swallow-Wort 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 Pittsburgh, Pennsylvania ⛅.

Black Swallow-Wort does not tolerate low-light 🚫.


How to fertilize Black Swallow-Wort

Nutrient, fertilizer, and repotting needs for Black Swallow-Wort: 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 Black Swallow-Wort after it doubles in size or once a year—whichever comes first.

Sunlight Needs

Care Summary for Black Swallow-Wort

Black Swallow-Wort

Black Swallow-Wort

Greg recommends:


0.5 cups every 9 days


< 1ft from a window


Repot after 2x growth

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

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