Polygonum lapathifolium — a medium houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Polygonum lapathifolium

Polygonum Lapathifolium

Updated · 209 observations
ON THIS PLANT

Polygonum lapathifolium, commonly known as pale smartweed, is a herbaceous plant belonging to the family Polygonaceae. Native to North America, it thrives in wetlands, marshes, and along riverbanks. The plant can grow up to 1 meter tall and features a branching stem with lance-shaped leaves that are green on top and pale underneath.

The flowers of Polygonum lapathifolium are small and pinkish-white, blooming in dense clusters at the ends of the stems from July to September. The plant produces small fruits known as achenes, each containing a single seed.

For centuries, Native Americans have used pale smartweed for its medicinal properties, particularly its anti-inflammatory effects. It was commonly applied as a poultice to treat skin irritations such as rashes and insect bites.

In addition to its medicinal uses, pale smartweed is a vital food source for various wildlife, including waterfowl, songbirds, muskrats, and beavers.

Overall, Polygonum lapathifolium plays a significant role in wetland ecosystems. It provides essential food for wildlife and contributes to soil stabilization along riverbanks and marshes where it grows abundantly.

A note from PlantMom

Redshank is fairly disease-resistant and usually does not develop illnesses. However, it can be vulnerable to pests and diseases present in its environment. These problems are generally mild. Regarding care, the plant requires moderate maintenance. It should be pruned regularly to keep a neat appearance and promote healthy growth. Fertilizing can also encourage flowering. Redshank is well suited for anyone with an outdoor area, such as a garden or patio, and does not demand extensive care experience. It may need more attention when grown indoors.

— PlantMom
CARE GUIDE

How to keep Polygonum Lapathifolium.

Light

Redshank comes from bright, open habitats and performs best in full sun. It tolerates partial shade but prefers direct sunlight for optimal growth. This plant, which can be annual or biennial, is noted for its sun-loving habit.

Temperature

Redshank can tolerate a wide range of temperature conditions, although its distribution can still be constrained by various combinations of moisture and heat. It grows best in warm summer climates with sufficient rainfall or irrigation. Extended periods of cloudy, rainy weather or prolonged high temperatures can raise the risk of Redshank dying. In winter, adequate protection from the cold can increase the plant's chances of survival.

Fertilizer

Redshank does well with regular, low-strength fertilizer applications to encourage healthy leaf development. Fertilize Redshank about once a month during the summer. Nitrogen is important for foliage, and providing nitrogen-rich sources helps Redshank thrive.

CHARACTERISTICS

Botanical profile.

Plant Type
Herb
Life Cycle
Annual, Perennial
Genus
Polygonum
Family
Polygonaceae
Hardiness Zone
4-10
Mature Height
20 cm to 61 cm
Mature Spread
30 cm to 49 cm
Leaf Color
Green
Leaf Type
Semi-evergreen
Flower Color
Pink
Flower Size
0.25 cm to 0.51 cm
Bloom Time
Summer, Fall
Planting Time
Spring, Summer, Autumn
Harvest Time
Late summer, Fall, Early winter
Native Area
Egypt, Turkey, Sweden, India, Austria, Slovakia, Montenegro, Pakistan, Slovenia, Morocco, Croatia, Yemen, Belarus, Uzbekistan, Russia, Iraq, Germany, Iceland, Estonia, Koppen, Romania, Latvia, South Korea, Belgium, Portugal, Netherlands, France, Tajikistan, Czech Republic, Bulgaria, Armenia, Poland, Laos, Greece, Ukraine, Serbia, Lebanon, Lithuania, Norway, China, Afghanistan, Syria, Kyrgyzstan, Kazakhstan, Italy, Spain, Switzerland, Vietnam, Japan, Finland, Denmark, Iran, Albania, Ireland, United Kingdom, Hungary, Algeria, Azerbaijan, Turkmenistan
ALSO KNOWN AS

Other names.

en Curlytop knotweed en Green Smartweed en Pale Persicaria en Pale Smartweed en Curltop Ladysthumb en Curlytop Smartweed en Dock-leaf Smartweed en Nodding Smartweed en Smartweed en Lady's thumb en Bulbous persicaria en Dock-leaved persicaria en Knotted persicaria en Pale willow weed
PLATES
Polygonum lapathifolium leaf
PLATE 01 · leaf
Polygonum lapathifolium leaf
PLATE 02 · leaf
Polygonum lapathifolium flower
PLATE 03 · flower
Polygonum lapathifolium flower
PLATE 04 · flower
Polygonum lapathifolium fruit
PLATE 05 · fruit
Polygonum lapathifolium fruit
PLATE 06 · fruit
ALSO IN THE LIBRARY

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