viljelyvyöhykkeet

Viljelyvyöhykkeet, also known as hardiness zones or growing zones, are geographical areas that define the limits of plant survival and growth. These zones are primarily based on average annual minimum winter temperatures, which are a key factor in determining which perennial plants can successfully overwinter in a particular region.

The concept of viljelyvyöhykkeet originated to help gardeners and farmers select plants that are likely to thrive in their local climate. By understanding the viljelyvyöhyke, one can make informed decisions about which trees, shrubs, and other perennial plants will withstand the cold and return year after year. For instance, a plant rated for a warmer zone might not survive a harsh winter in a colder zone, while a plant rated for a colder zone would likely do well in a warmer climate, potentially even becoming invasive.

Different countries and regions have developed their own viljelyvyöhykejärjestelmät. In Finland, the viljelyvyöhykejärjestelmä is based on the average temperatures during the growing season and the length of the frost-free period, in addition to winter cold. This system categorizes areas into zones from I (mildest) to VII (coldest), with variations within these zones. Understanding the specific viljelyvyöhyke for a location is crucial for successful gardening and horticulture, especially when dealing with perennial species.