Plant Care German Knotgrass

German Knotgrass

Also known as

German-knotweed, annual knawel and knawel


Scleranthus annuus

How to care for German Knotgrass


How often to water your German Knotgrass

Water needs for German Knotgrass
0.5 cups
every 9

German Knotgrass needs 0.5 cups of water every 9 when it doesn’t get direct sunlight and is potted in a 5" pot located in Madison, Wisconsin.

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 German Knotgrass

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 German Knotgrass in Madison, Wisconsin

Madison, Wisconsin

35% Very Low

Finding light for German Knotgrass in your home

Light needs and placement for plant German Knotgrass: 1ft from a window
1ft or less from
a window

German Knotgrass 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 Madison, Wisconsin ⛅.

German Knotgrass does not tolerate low-light 🚫.


How to fertilize German Knotgrass

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

Water Needs
Sunlight Needs
Growth Pattern

Care Summary for German Knotgrass

German Knotgrass

German Knotgrass

Greg recommends:


0.5 cups every 9 days


< 1ft from a window


Repot after 2x growth

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

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