Terracotta breathes, which suits Mediterranean herbs and anything that hates wet roots, but it can crack in a hard frost unless it is frost-proof and raised off the ground.
Glazed pots hold water longer and survive frost well. They suit thirsty plants and spots that are hard to reach with a watering can.
Fibre and resin pots are light, which matters on balconies and roofs. They last for years if they are kept out of constant sun.
