With the Treetec® Nordic System, it is also possible to sustainably grow trees in planters in heavy frost zones. In climates with very harsh and long winters, such as in parts of Scandinavia and Canada, trees can dehydrate quickly due to a lack of water. The delicate, early sunshine of spring is often insufficient to reactivate the sap streams in time as a result of the soil having been frosted for too long. By integrating heating cables with the capillary columns, sufficient irrigation and oxygen circulation is made possible. Incorporating a battery box in the tree planter ensures that the trees remain mobile.