This mini concrete pot is especially designed for airplants. They are approximately 2.25″ tall x 1.5″ diameter. Concrete pots are porous so water can evaporate quickly, making them the perfect pot material for cacti, succulents, and air plants. Concrete planters are durable and great at insulating plants against sudden temperature fluctuations. Concrete can absorb and radiate heat, which can protect roots against late or early frosts.