Don't Throw Away That Old Styrofoam Box! | The Hypertufa Gardener
Expanded Polystyrene used to Insulate Above Ground Planters | Geofoam, Styrofoam, EPS & Polystyrene | Universal Construction Foam
Amazon's wasteful packaging redeems itself by serving as winter insulation for outdoor potted plants. Ugly, perhaps, but it's winter, so who cares? : r/gardening
How to Install Winter-Proof Planters | Ask This Old House - YouTube