- Paspalum weeds, also called knotgrass, are a flat-leaved type of grass weed. The leaves of paspalum weed are typically about 2 to 6 inches long and they may have a purplish hue, particularly around the edges. Paspalum weed grows in dense clumps with short rhizomes and hardy stems. Its tall flower stalks consist of about four to seven spikes that grow horizontally from the upper portion of the stem. These spikes carry the seeds, which are distributed when the plant is disturbed. The seeds may stick to clothing and other plants, and birds may also pick them up. Mowing and grading areas of lawn can often transport the seeds to new areas as well.
- Paspalum weed typically grows in turf grasses and requires warm conditions to thrive. Most varieties are native to South American regions but have been naturalized in many parts of the United States. Paspalum grows best in moist sandy loam and clay soils, and although it prefers moist soils, its long roots enable it to survive periods of drought and flooding.
- Some varieties of paspalum weeds are often grown as pasture, hay and for use as silage. Paspalum weed is also grown to help prevent or control soil erosion due to heavy runoff.
- You can control paspalum by poisoning with glyphosate if a high enough concentration is used. However, glyphosate is not a selective herbicide and will kill other grasses as well. To spot treat with glyphosate, cover the crown of the plant using a paintbrush. To eliminate isolated areas of paspalum without chemicals, cut into the ground with a sharp knife and dig the entire crown of the plant out.
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