植树 (zhí shù) literally means 'to plant trees' — combining 植 (zhí), meaning 'to plant' or 'to cultivate', and 树 (shù), meaning 'tree'. It is a compound verb commonly used in environmental, educational, and civic contexts, especially during springtime campaigns like China’s annual Arbor Day (March 12). Unlike general terms for planting (e.g., 种植), 植树 specifically emphasizes the act of placing young trees into soil with care, often for ecological restoration, carbon sequestration, or public greening.

The word carries positive connotations of responsibility, sustainability, and collective action. It frequently appears in formal announcements, school activities, volunteer programs, and government initiatives. While it can be used transitively (e.g., 植树造林), it’s also common as an intransitive activity noun — for instance, in phrases like 参加植树 (take part in tree planting). Its usage is neutral in register but leans slightly formal or institutional, rarely appearing in casual daily speech without context.