These 30 litre heavy duty pots are made to last for up to 10 years and are totally frost proof they are frequently used by professional growers where they are intended to last the entire time a tree or large plant will be growing on the nursery which shows just how good they are r they have strong grab handles on either side which make it quick and easy to move them around whenever you need to do so they also have pre formed drainage holes on the bottom and side of the pots to ensure yo