Discussion
The most serious weed in lawns is:
Answer: C
The most serious weed in lawns is Cyperus rotundus, nutgrass or purple nutsedge, which spreads by tubers and rhizomes, tolerates mowing and is very hard to eradicate.
Agrostis tenuis (bent grass), Axonopus affinis (carpet grass) and Paspalum vaginatum (seashore paspalum) are themselves lawn grasses, not weeds.
Nutgrass spreads by underground tubers and survives mowing and many herbicides, which is why it is called the most serious lawn weed. Its leaves grow faster than those of lawn grasses, so it stands out as coarse yellowish-green tufts in a lawn.
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