Clay pots are as classic a garden feature as they come. But clay cracks. It expands and contracts as temperatures changes. As winter approaches, here’s everything you need to know about why terra cotta planters fall apart—and how to prevent yours from cracking. The main risk to terra cotta planters is that water trapped inside freezes—therefore expands—come wintertime and causes the pot to crack. Small cracks might go unnoticed during the winter, but try to move the pot come spring and it may fall apart. When the weather cools, empty any planters whose residents won’t survive the winter. Compost the plants and move the planters inside. Keep reading the tutorial in the source.