Because of people, plants don't always stay in one place. A wheeled container garden is your solution to for easy arrangements on a deck or patio. If you want to move a patio dining set over to a shady corner for the summer, for example, you can wheel your planters around to make space.
The simplest solution to heavy pots is to add a wooden rack with wheels underneath. Similar to what you might use to move furniture, these are nothing more than a wooden square with casters mounted to the four corners. The caddy isn't permanently attached to the container, so you only need one to move all your pots, as long as you have someone to help you lift each one on to the caddy. Use casters rated for weight of the pots you're moving.
Rolling Vegetable Garden
To grow more than a few of any vegetable, you need a sizable planter. A pair of 2-foot-wide, 4-foot-long wooden boxes about 8 to 10 inches deep is enough to grow salad greens for the family, but they weigh more than 100 pounds each when full of soil and plants. Build the boxes with rot-resistant lumber, such as the naturally stylish cedar or redwood, and drill 1/2-inch drain holes every 6 to 8 inches in the bottom. Bolt sturdy casters to the bottom and you're good to go. Roll those salad greens to a sunny, south-facing wall for an early start in spring and over to a cooler, east-facing wall in summer to keep them from bolting in the heat.
Revolving Flower Arrangement
Make multiple rolling planters of different widths and heights for a range of design options. Flowers and ornamental grasses don't need huge containers. Build them in various increments of 1 cubic foot and experiment with a different geometric design, each time you re-plant. Use proportions and try different ways of nesting them together into the corner of a patio or as the centerpiece.
Convert a worn out wheelbarrow or garden cart into a movable container garden by simply drilling drain holes and filling it with a lightweight potting mix. This is a smart option if you have an attractive vintage cart or wheelbarrow. In this case, don't paint it or try to fix it up, but let it exude the rustic charm it already has. If industrial style isn't your thing, exercise your creative muscles and paint the exterior with a fun, floral design.