This is impossible to answer, but remember Bamboo is a grass so it could be very long.
The longest recorded blade of grass was about 20 feet (6.1 meters) long. This exceptional grass blade was found in Brazil in 2008. Typically, grass blades range in length from a few inches to a few feet.
This question is unanswerable as it depends on which type of grass you mean.
Do you mean a Blade of grass.
The longest song ever in the USA was 75 minutes
Hachrt
The longest fingernail ever was...
47.22 seconds
longest ever
18.7 in
Scythes are tools having a long handle and a long curved single-edged blade. They are used to cut grass, crops, or other plants by swinging the blade close to the ground.
Cows will eat long grass. Haven't you ever heard, "The cow's in the corn?" Corn is a tall grass.
The longest ruler ever recorded was 363 feet long. It was made in 2015 in Chicago, USA, to commemorate the opening of a new museum.
the longest jumprope is where about 80 people can jump in at the same time imagine that! really long!!!!!