This is a common question for urban gardeners. The short answer is: it depends, but they can be challenging to move once full. A planter box filled with moist soil becomes extremely heavy. The ease of movement primarily depends on its size, material, and design.
Small to medium planters might be shifted with effort, but large ones are often immovable without assistance. Key factors affecting mobility include the planter's weight capacity, its built-in features like wheels or handles, and the surface it sits on. For instance, planters on smooth patios slide more easily than those on rough grass.
To improve mobility, consider these tips before filling: place the planter on a wheeled caddy or dolly from the start, choose planters with integrated casters, or use lightweight potting mix. For already-filled heavy planters, partially emptying the soil or using a furniture slider can help. Ultimately, planning the final location before filling is the best strategy for a stress-free urban gardening experience.