Weeds grow quickly due to several factors, such as their ability to produce large numbers of seeds, their efficient use of resources, and their resistance to environmental stressors.
For example, many weed species produce vast amounts of seeds that can quickly take root and grow into new plants. Additionally, weeds often have deep root systems that allow them to access nutrients and water from lower soil layers, and they are very efficient at photosynthesis, which enables them to produce energy and grow quickly.
Moreover, weeds are often adapted to harsh environments and can tolerate extreme conditions such as drought, high or low temperatures, and poor soil quality. Lastly, the lack of natural enemies and predators also enables them to grow without any competition from other plant species.