Plant Care Giant Ragweed

Giant Ragweed

Also known as

Giant ragweed, Great ragweed, Tall ragweed, Blood ragweed, Perennial ragweed, Horseweed, Buffaloweed and Kinghead


Ambrosia trifida

How to care for Giant Ragweed


How often to water your Giant Ragweed

Water needs for Giant Ragweed
0.5 cups
every 9

Giant Ragweed 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.

Calculate water needs of Giant Ragweed

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 Giant Ragweed in your home

Light needs and placement for plant Giant Ragweed: 1ft from a window
1ft or less from
a window

Giant Ragweed love being close to bright, sunny windows 😎.

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

Giant Ragweed does not tolerate low-light 🚫.

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


How to fertilize Giant Ragweed

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

Water Needs
Sunlight Needs
Growth Pattern
Growing Outdoors

Care Summary for Giant Ragweed

Giant Ragweed

Giant Ragweed

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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