Plant Care American Watermilfoil

American Watermilfoil

Also known as

Siberian water-milfoil, shortspike watermilfoil, American water-milfoil, common water-milfoil, northern spiked water-milfoil, northern water-milfoil, pale water-milfoil, short-spiked water-milfoil, spiked water-milfoil and whitish water-milfoil


Myriophyllum sibiricum

How to care for American Watermilfoil


How often to water your American Watermilfoil

Water needs for American Watermilfoil
0.5 cups
every 9

American Watermilfoil 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 American Watermilfoil in your home

Light needs and placement for plant American Watermilfoil: 1ft from a window
1ft or less from
a window

American Watermilfoil love being close to bright, sunny windows 😎.

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

American Watermilfoil does not tolerate low-light 🚫.

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


How to fertilize American Watermilfoil

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

Water Needs
Sunlight Needs

Care Summary for American Watermilfoil

American Watermilfoil

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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