Frostproof Gardenware Handmade In The UK Specially selected clay is used to make all of the flowerpots in this range. The natural terracotta, which is all quarried in Yorkshire, is regularly tested for its durability and its unique structure, together with high firing temperatures, means that all items are both frostproof and porous. All of the pots are made by hand on the potter's wheel by a small team of highly skilled craftsmen. With over 100 years experience between them, the team are constantly developing new designs for the enthusiastic gardener, producing the ultimate pots for container gardening.