At what growth stage does the stem extend and leaves multiply?

The growth stage characterized by stem extension and the multiplication of leaves is the vegetative stage. In this phase, the plant focuses on establishing a strong structure necessary for supporting future growth. During the vegetative stage, the plant will develop its foliage and root systems, which are crucial for photosynthesis and nutrient uptake, respectively. This is vital for laying the groundwork for subsequent growth stages, specifically the reproductive stage, where the plant will use the energy and resources accumulated during the vegetative phase to produce flowers and seeds. The stem's extension allows the plant to position its leaves higher for optimal sunlight exposure, further enhancing its growth and development.