# giant ragweed (*Ambrosia trifida*) Giant ragweed is a tall plant that can grow very high, sometimes over 10 feet! It has big, green leaves and produces lots of tiny flowers that turn into seeds. - **Category:** [Plants](https://www.snappit.app/explore/categories/plant) - **Rarity:** Common - **Danger:** 2/5 · Low - **Snaps:** 30 - **Habitat:** Grasslands ![giant ragweed](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Ambrosia_trifida_%28inflorescences%29.jpg&width=800) Photo: Le.Loup.Gris, CC BY-SA 3.0 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Ambrosia_trifida_%28inflorescences%29.jpg) ## Appearance The giant ragweed is a towering plant, often reaching impressive heights, with thick, rough, reddish-green stems. Its large, deeply lobed leaves resemble a bird's foot. The inconspicuous greenish-yellow flowers grow in tall spikes, giving the plant a rather plain but imposing appearance. ## Taxonomy - **Kingdom:** Plantae - **Phylum:** Tracheophyta - **Class:** Magnoliopsida - **Order:** Asterales - **Family:** Asteraceae - **Genus:** Ambrosia ## Interesting facts - Ancient people once harvested its nutritious seeds for food and oil. - Giant ragweed can help clean polluted soil by soaking up heavy metals. - Its super-fine pollen can travel hundreds of miles, causing allergies far away! - One giant ragweed plant can produce over a billion pollen grains in a single season! ## Special abilities - **Pollen Powerhouse:** Giant ragweed can produce billions of lightweight pollen grains that travel vast distances, helping it spread far and wide. - **Rapid Growth Spurt:** Giant ragweed has an incredibly fast growth rate, allowing it to quickly outcompete other plants for vital sunlight and resources. - **Super Seed Survival:** Giant ragweed seeds can remain viable, or alive, in the soil for decades, giving it a powerful advantage for future growth. ## Measurements & details - **Height:** 100-400 cm - **Spread:** 50-150 cm - **Flower Size:** 0.2-0.5 cm - **Bloom Season:** Late_summer_fall - **Edible:** No - **Toxicity:** None - **Lifecycle:** Annual - **Pollination Method:** Wind ## Ecological connections - **Eats:** [Song Sparrow](https://www.snappit.app/explore/song-sparrow) (*Melospiza melodia*) — Eats its oil-rich seeds, especially in winter. - **Eats:** [American Goldfinch](https://www.snappit.app/explore/american-goldfinch) (*Carduelis tristis*) — Feeds on the numerous seeds, a vital food source. - **Parasitizes:** Ragweed Rust (*Puccinia xanthii*) — This fungus specifically infects and weakens giant ragweed plants. - **Eats:** Squash Lady Beetle (*Epilachna borealis*) — Larvae and adults sometimes feed on ragweed leaves. ## Traits - [Deciduous](https://www.snappit.app/explore/traits/deciduous): Deciduous plants periodically shed all their leaves, typically during autumn or dry seasons. - [Flowering](https://www.snappit.app/explore/traits/flowering): Flowering plants are any plants that produce flowers as part of their reproductive cycle. - [Edible](https://www.snappit.app/explore/traits/edible): Edible plants are those parts of a plant that are considered safe for human consumption. - [Grassland](https://www.snappit.app/explore/traits/grassland): Grassland habitats are terrestrial biomes dominated by grasses and herbaceous plants, supporting a variety of grazing animals. - [Pollinator Magnet](https://www.snappit.app/explore/traits/pollinator-magnet): Describes plants that are particularly attractive and beneficial to a wide range of pollinating organisms. - [Rapid Growing](https://www.snappit.app/explore/traits/rapid-growing): Rapid growing plants exhibit accelerated growth rates, quickly increasing in size and biomass within a short period. - [Keystone Species](https://www.snappit.app/explore/traits/keystone-species): Describes a species whose presence and role have a disproportionately large effect on its environment. - [Giant](https://www.snappit.app/explore/traits/giant): Giant describes organisms or objects of significantly larger size than average for their species or type. ## Collections - [Plants](https://www.snappit.app/explore/collections/plants) ## Safety **Danger:** 2/5 · Low Be careful not to touch the plant if you have allergies, as it can cause sneezing. ## Frequently Asked Questions ### How to identify giant ragweed? Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details. ### How tall is giant ragweed? 100-400 cm ### How wide does giant ragweed spread? 50-150 cm ### How big are the flowers on giant ragweed? 0.2-0.5 cm ### When does giant ragweed bloom? Late_summer_fall ### Is giant ragweed edible? No ### Is giant ragweed toxic? None ### What is giant ragweed's lifecycle? Annual ## Where to spot - [American Baptist College](https://www.snappit.app/guides/places/american-baptist-college) — Tennessee, US · Campus - [Anderson Japanese Gardens](https://www.snappit.app/guides/places/anderson-japanese-gardens) — Illinois, US · Botanical Garden - [Cedar Valley Arboretum & Botanic Gardens](https://www.snappit.app/guides/places/cedar-valley-arboretum-and-botanic-gardens) — Iowa, US · Botanical Garden - [Delaware and Raritan Canal](https://www.snappit.app/guides/places/delaware-and-raritan-canal) — New Jersey, US · Historic Site - [Dundee Canal](https://www.snappit.app/guides/places/dundee-canal) — New Jersey, US · Historic Site - [East Wetumpka Commercial Historic District](https://www.snappit.app/guides/places/east-wetumpka-commercial-historic-district) — Alabama, US · Historic District [View all places to see giant ragweed](https://www.snappit.app/guides/where-to-see/giant-ragweed) ## More Plants - [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*) - [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*) - [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*) - [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*) --- Source: [Giant Ragweed: Facts & Places to See — Snappit](https://www.snappit.app/explore/giant-ragweed)