Top 20 Most Common Weeds in Rwanda

Rwanda's temperate climate and abundant rainfall create an ideal environment for a variety of garden weeds, demanding constant vigilance from gardeners. Among the most common weeds, Creeping woodsorrel, Horseweed, and Flaxleaf fleabane are particularly tenacious, often outcompeting domestic plants for resources. The proliferation of such weeds poses a challenge for maintaining intended flora, reflecting an ongoing battle between natural robustness and cultivated order.

Most Common Weeds

1. Creeping woodsorrel

Creeping woodsorrel (Oxalis corniculata) is a flowering herb which grows aggressively. The leaves have a lemony flavor and are often made into tea that's rich in vitamin C. However, if ingested in large amounts the oxalic acid for which the genus is named can begin to block the body's calcium absorption.

2. Horseweed

Horseweed is a North American herbaceous annual plant with a hairy stem, numerous pointed leaves, and waxy inflorescence. It has been naturalized in Eurasia and Australia, where it is a common weed in urban and agricultural regions. Horseweed can be used in a survival situation to start a friction fire.

3. Curlytop Knotweed

Curlytop Knotweed is an annual herb that grows 20 to 79 cm tall. It features purplish stems that bulge at the joints. Flowers bloom in mid to late summer and are tiny and pink. Its fruit is a rounded, flat nut.

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4. Flaxleaf fleabane

Flaxleaf fleabane (Erigeron bonariensis) is an annual plant with distinctive blue-green foliage. Flaxleaf fleabane is considered a weed. This species is often found growing along concrete cracks in driveways and sidewalks. Tt is also found in pastures, gardens and roadsides. Flaxleaf fleabane produces many seeds, which are dispersed by wind and transported by animals, vehicles and people.

Growth Rate:

Rapid

5. Shaggy soldier

A member of the daisy family, Galinsoga quadriradiata can be an invasive weed that is especially harmful to organic crops. The sticky seeds can hang on to livestock and people, creating an additional nuisance. Each plant can produce over 7000 seeds, and it can reduce crop production by up to half.

6. Cleavers

Cleavers are widely-distributed weeds found around the world. They grow many nearly invisible hook-shaped spines on their stems. These make the plant feel sticky to the skin, and can cause contact dermatitis in some individuals. Cleavers come from the same family as coffee and can be used to create a less caffeinated version of coffee.

Growth Rate:

Rapid

7. Prostrate sandmat

Prostrate sandmat (Euphorbia prostrata) is a plant species native to tropical regions of North and South America and the central United States. Prostrate sandmat has spread all over the globe and is considered an invasive species. This resilient plant often sprouts up through cracks in asphalt on roadsides.

Growth Rate:

Rapid

8. Nut grass

Nut grass can be found all over the world. This perennial plant gets its name because its tubers resemble nuts. Nut grass is considered one of the most invasive plants in the world, and among the most difficult to eradicate. It reduces crop yields and is resistant to most herbicides.

Growth Rate:

Rapid

9. Virginia pepperweed

Virginia pepperweed (Lepidium virginicum) is a plant species native to North America with the exclusion of certain parts of Canada. Every part of the virginia pepperweed plant is edible and has a peppery taste. This plant can be used as a substitute for black pepper.

10. Blue porterweed

Blue porterweed is native to the Caribbean and considered an invasive species in many areas outside.

11. Common plantain

While native to Europe, the common plantain was one of the first plants to reach North America through early European explorers. Native Americans have referred to Plantago major as 'white man's footprint', as it disrupted many local ecosystems by its introduction.

Growth Rate:

Moderate

12. Spiny sowthistle

The spiny sowthistle is considered a noxious and invasive weed in many areas. Its flowers resemble those of a dandelion and its leaves, although covered in spines, are edible. This plant can grow up to 1.8 m and sap that resembles milk will leak out of the leaves and stem if they are broken or cut.

Growth Rate:

Rapid

13. American black nightshade

American black nightshade (*Solanum americanum*) is a flowering herb with unknown native origins, and it is poisonous. Its berries should not be consumed, as berry consumption has resulted in death in children.

14. Mexican tea

Mexican tea (Dysphania ambrosioides) is native to tropical parts of the Americas. Both the leaves and stems have tiny glands that give off a bad-smelling odor. It’s a weed that grows along the sides of roads and stream beds.

Growth Rate:

Rapid

15. Asthma-plant

Asthma-plant (Euphorbia hirta) is a ground-hugging spurge weed whose branches can grow to 61 cm long. It blooms from summer through early fall, dying off after the first frost. A milky sap will seep from broken stems or leaves. It can be a nuisance weed that reproduces rapidly.

Growth Rate:

Rapid

16. Artillery plant

The artillery plant is often utilized as a groundcover or an ornamental in many landscapes. It's commonly named the "artillery plant" because the males generally produce pollen in an explosive way. It grows best in a humid environment in partial shade or indirect sunlight. It's a particularly popular plant in indoor rock gardens.

17. Arrowleaf sida

Arrowleaf sida (Sida rhombifolia) is a perennial plant with delicate yellow blooms on stiff, almost woody stems. The stems are used to make brooms, giving it the common name "broom jute." It is also used to make cord and twine.

18. Redflower ragleaf

Crassocephalum crepidioides is a slightly succulent herb that can grow up to 1.8 m tall. The plant has mucilaginous and fleshy leaves, though its stems are eaten as a vegetable. It's largely prominent in tropical Africa.

19. Purple amaranth

Purple amaranth (Amaranthus blitum) is an annual plant that often grows as a weed. It is not often cultivated, but some people around the world gather the leaves and stems to be eaten as boiled vegetables. It is particularly common in Greek and Lebanese kitchens.

20. Common chickweed

The common chickweed gets its name due to the fact that chickens love to eat it, though they're not alone in that respect. Though it's often considered a nuisance weed, most parts of this plant can be consumed raw or cooked and used similar to spinach. The saponins in common chickweed are slightly toxic but will only have an effect if ingested in huge quantities.

Growth Rate:

Rapid

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