Lateral meristem is a type of plant tissue responsible for secondary growth, which increases the thickness of stems and roots. It is found in the cambium and cork cambium, allowing plants to grow wider over time. This growth is essential for supporting larger structures and improving the plant's ability to transport nutrients and water. The lateral meristem produces new cells that differentiate into various tissues, including xylem and phloem. This process helps in forming the bark and contributes to the overall strength and stability of the plant. Lateral meristems play a crucial role in the development of woody plants and trees.