Unlike an indoor pot, an outdoor planter lives through all four seasons: sun in summer, frost in winter. The right choice and a few simple precautions extend a planter’s life by years.
What cracks a pot in winter is not the cold but freezing water. When water left in the soil freezes, its volume expands and pushes against the wall from the inside. Three measures are enough: keep the drainage hole open, lift the pot off the ground and reduce watering in winter.
Terracotta is porous, so it absorbs water and cracks when it freezes. UV-resistant polypropylene pots, on the other hand, stay flexible and do not break in freeze-thaw cycles. This is the biggest advantage of plastic pots in gardens and on terraces.
Outdoors, a small pot is at a disadvantage in two ways: it dries out quickly in summer and freezes quickly in winter. A large mass of soil buffers temperature changes. For the garden, try not to go below 25 liters. Arch Garden is produced in the 9–136 liter range and Villa Garden in the 39–95 liter range.
On a south-facing side, a dark pot overheats the soil; the root zone can exceed 40 °C. Prefer light colors (terracotta, off-white, stone white). Pots without UV additives turn matte and brittle within a season; the “UV-resistant” label is non-negotiable outdoors.
Do not set the pot directly on concrete or tile. Water left underneath both stains the floor and causes the pot to absorb water from below. Footed models, wheeled saucers or simple blocks solve this problem. For large pots, a wheeled saucer also makes seasonal repositioning easier.
For delicate plants, move the pot against a wall, on the side that is sheltered from the wind; wrap the body with burlap or fleece fabric. Burying the pot in the ground is also a classic method: the soil protects the root zone from frost.