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Smooth crabgrass
Also known as: Smooth Summergrass, Smooth Crab Grass, Small crabgrass
Smooth crabgrass is a weed commonly found in yards and other turf. This low-growing grass typically reproduces from seed. Although commonly found in lawns, this species of crabgrass is not as aggressive as other types.
Scientific classification
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Annual, Biennial
Lifespan
Grass
Plant Type
Summer, Early fall
Bloom Time
15 cm to 46 cm
Plant Height
15 cm to 45 cm
Spread
Green
Leaf Color
2.5 cm
Flower Size
Green, Yellow, Purple, Brown
Flower Color
Winter dormancy
Dormancy
Deciduous
Leaf type

Images of Smooth crabgrass

Distribution of Smooth crabgrass

Distribution Map
Smooth crabgrass is a widespread plant, native to a broad swathe of Europe and Asia, spanning from the Mediterranean region to East Asia. Its natural range stretches from the subtropics to temperate zones. Furthermore, smooth crabgrass has been introduced to various continents including North America, South America, Australia, and parts of northern Europe, where it has established itself in diverse climates and environments.
Native
Cultivated
Invasive
Introduced
No species reported
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Habitat
Disturbed areas
Hemisphere Trend Curve

Weed Control

Smooth crabgrass originates from Europe and is commonly known as a weed due its potency to spread rapidly and reproduce in a quick manner. The plant produces a hefty amount of seeds which are a source of its widespread. Furthermore, it has a robust root system which enables it to survive even under unfavorable conditions making its eradication difficult. Known for its aggressiveness, the plant can stunt the growth of other plants in its vicinity by competing for resources, causing significant harm to gardens. Lastly, the major contributing factor in smooth crabgrass spread is its ability to reproduce through seeds and the perseverant root system.
How to Control It
The best season for removal of smooth crabgrass is during the late spring and early summer, before the plant reaches its flowering stage and sets seeds. Here are the methods to control or remove this weed:
  1. Hand Pulling: In the early stages of growth when the soil is wet, it's easier to pull smooth crabgrass out by hand. Ensure you pull out entire root to prevent the plant from regrowing.
  2. Solarization: This method uses the sun's heat to kill the plant. Cover the area populated by smooth crabgrass with a clear plastic sheet and leave it there for 4-6 weeks. This will bake the plant and its seeds, making it easier to remove.
  3. Mulching: Mulching prevents light from reaching smooth crabgrass which hinders its growth. Spread a 3-inch thick layer of organic mulch around your plants, leaving a little space around each plant's stem to prevent rot.
  4. Vinegar Spray: In a spray bottle, mix one part of white vinegar with one part of water. Spray this mixture directly onto smooth crabgrass leaf surfaces. Be careful not to spray it on your desirable plants as vinegar is non-selective and can harm them.
  5. Lawn Mowers: Mow regularly while smooth crabgrass is still in its vegetative state, and before it sets seed. This will exhaust the plant's energy reserves and prevent reproduction.
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Quickly Identify Smooth crabgrass

1
Prostrate, clump-forming growth habit with rooting leaf nodes.
2
Small, egg-shaped spikelets in flower clusters on stem ends.
3
Distinct color evolution of fruit from green to dark brown/black.
4
Flat leaves up to 4 inches (10 cm) long with smooth texture.
5
Slender stems ranging from light green to purple, occasionally flattened.
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RELATED: How to identify Smooth crabgrass

Care Guide for Smooth crabgrass

Twice per week
Water
Full sun
Sunlight
20 - 35 ℃
Ideal Temperature
Garden Soil
Soil Type
Water: Smooth crabgrass thrives in warm-season areas and prefers drier conditions, requiring moderate watering of about twice a week. It benefits from rainwater during the growth season, enhancing its resilience and ability to endure variable moisture levels.
Propagation: Smooth crabgrass propagates easily by sowing in spring, showcasing low difficulty. Success is indicated by emerging seedlings and young leaves, with no additional tips required for its cultivation.
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