




Reynoutria japonica
Japanese knotweed is a tall plant with big green leaves and white flowers. It grows quickly and can be found in many places, often near water. It's important to know about it because it can take over other plants!
Habitat: Urban areas
The Japanese knotweed has sturdy, hollow stems that are often reddish-purple, resembling bamboo. Its leaves are heart-shaped or spade-like, bright green, and grow alternately along the stem, making it distinct from many native plants. Small, creamy-white flowers appear in clusters.





Category
PlantsRarity
Common
Danger
2/5 · Low
Snaps
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Its roots can break through concrete and asphalt!
Some call it the "Hulk Plant" because it's so tough to get rid of!
This plant can grow a whole foot taller in just one summer day!
Young knotweed shoots are eaten like rhubarb in Japan for tasty treats!
Japanese knotweed can grow incredibly deep and strong roots that help it break through concrete and even house foundations!
Japanese knotweed can regrow from tiny stem or root fragments, helping it quickly spread and survive almost any damage.
Japanese knotweed grows so fast and dense that it shades out other plants, helping it dominate new areas quickly.
Apis mellifera
Visits its white summer flowers.
Gallerucida bifasciata
Beetle larvae munch its leaves (native).

Passer domesticus
Small birds hide in dense thickets.
Deciduous plants periodically shed all their leaves, typically during autumn or dry seasons.
Flowering plants are any plants that produce flowers as part of their reproductive cycle.
Medicinal plants possess chemical compounds that can be used for therapeutic purposes to treat illnesses or maintain health.
Describes plants that are particularly attractive and beneficial to a wide range of pollinating organisms.
Rapid growing plants exhibit accelerated growth rates, quickly increasing in size and biomass within a short period.
This habitat trait indicates species that can coexist with humans in urban and suburban environments, utilizing man-made structures and green spaces.
Invasive species are non-native organisms that cause harm to the environment, economy, or human health.
No aliases listed yet.
Danger
2/5 · Low
Do not touch or eat any part of the plant without asking an adult first.
200-400 cm
100-500 cm
0.1-0.3 cm
Late_summer_early_fall
Yes
Mild
Perennial
Insect
Zoom in to split clusters and explore where this object has been snapped.
Recent snaps will appear here as new observations are added.
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Maryland, US
You might spot White-Tailed Deer and Japanese Knotweed.
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Massachusetts, US
You might spot Duck, American Robin, and Mute Swan.
View guide →

Massachusetts, US
You might spot House Sparrow, Garlic Mustard, and Duck.
View guide →

Virginia, US
You might spot American Robin, Northern Cardinal, and House Sparrow.
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Massachusetts, US
You might spot White Mulberry and Mourning Dove.
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Massachusetts, US
You might spot Japanese Knotweed and Common Eastern Bumble Bee.
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