About these saucers: Made from renewable and sustainable plant by-products, these are an environmentally friendly alternative to plastic pots and saucers. Tests have shown that plants grow better in these than in traditional plastic pots due to their insulating design, leading to thriving, healthy plants. The pots contain no wood or petroleum ingredients and do not deplete natural or edible resources. When used outdoors, they will last at least five years and even longer when used indoors. They are intended for use above the ground and show no damage when exposed to freezing or thawing conditions.