How "Fast" Does the Bamboo Grow

The bamboo grove along the back yard fence sends out roots every year from which new Bamboo grows. And grows really fast. Each spring we kick over the new shoots that appear in the yard sp they don't take over the yard. This year I put a 50 inch tall fence post next to a 5 inch sprout (first picture) to track how fast the bamboo grows. These pictures are taken one week apart. The bamboo went from 5 inches to 30 inches in one week. After two weeks it shot up to 90 inches and after 3 weeks it was 192 inches or 16 feet tall. The tallest ones will top out at 40 feet.