Growing a small zelkova tree in an outdoor plant box is entirely possible, provided you meet its basic needs. Zelkovas, often used for bonsai or ornamental purposes, thrive in well-draining soil and require ample sunlight—at least 6 hours daily. Choose a spacious plant box with drainage holes to prevent root rot. Regular watering and occasional pruning will help maintain its compact size and health. While zelkovas are hardy, protect them from extreme cold by moving the box indoors or insulating it during winter. With proper care, your zelkova can flourish in a container, adding elegance to your outdoor space.