All of our hand-thrown terracotta pots and planters are guaranteed to be frost-resistant so long as you take a few important, yet very easy, precautions.
The most important factor is to ensure good and adequate drainage. The first step is to ensure there is a drainage hole in the bottom of your pot. Most of our pots come with drainage holes as standard, but we will drill drainage holes for you if needed. Alternatively it is very easy to do yourself with a standard masonary drill-bit with the drill set to a standard setting (ie not a hammer drill!)
Secondly, it is vital that you line the bottom of your terracotta pot with a good layer of drainage material (stones, crocks, gravel or polystyrene blocks) before filling with compost. This will allow the soil to drain more freely and avoid any water-logging. This is especially important with pots that taper inwards towards the top.
We also recommend using blocks/bricks, or our attractive terracotta pot feet, to raise the pot slightly off of the ground. This helps drainage but also allows air to circulate better around the root system of your plant.
Our moulded terracotta products are frost-proof, however very occasionally moulded pots can develop a flaking of the rims if placed on a south-facing patio or garden due to the continuous freeze/thaw cycle during the winter months. The rims can - after a few years - turn brittle and resemble a slate/flaky pastry resemblance. This is due to the stress that the clay is placed under when being forced into the mould, and can easily be avoided by placing it in a location that will avoid direct sunlight after frosts. This only happens in typically less than 10% of moulded pots.
In 25 years, we have never heard of any of our hand-thrown terracotta products succumbing to frost damage.