California Home Spas SHPUBSI Silver Rolling Planter Box Umbrella Base. The Rolling Planter Box Umbrella Base offers a decorative, high-end touch to your outdoor living area while also performing the necessary task of holding your umbrella in place. Crafted from powder coated steel, this base is rust-resistant and made to last for years. The planter base holds up to 250 pounds of sand, rocks, soil, or other decorative media.