Our large and extra-large terracotta planters are built for specimen trees, architectural landscaping, and commercial installations — 60cm to 100cm+ diameter, with wall thickness engineered up to 20mm at the largest sizes to handle the load and freeze-thaw stress that thinner walls can't. This is the range landscape architects and property developers specify when a container needs to hold a mature olive tree or anchor a hotel courtyard for years, not seasons. Every piece is fired in a beehive kiln at sustained high temperature, which is what actually determines whether a large planter survives its first winter intact.