Growth
In warmer and more favorable climates, perennials grow continuously. In seasonal climates, their growth is limited to the growing season. For example, in temperate regions a perennial plant may grow and bloom during the warm part of the year, with the foliage dying back in the winter. These plants are deciduous perennials. Regrowth is from existing stem tissue. In many parts of the world, seasonality is expressed as wet and dry periods rather than warm and cold periods. In some species, perennials retain their foliage all year round; these are evergreen perennials.
With their roots protected below ground in the soil layer, perennial plants are notably tolerant of wildfire. Herbaceous perennials are also able to tolerate the extremes of cold in temperate and Arctic winters, with less sensitivity than trees or shrubs.
Knowing the planting zone can be very useful planning a garden and flower bed areas. Gardeners should compare their garden climates with the climate where a plant is known to grow well. Most plants are marked with a zone number which corresponds with a region on a map where that plant will survive. While a range of zones might be listed, the lower of the zone numbers indicates the lowest recommended zone in which that plant can survive. It is possible that a plant might thrive outside a labeled zone area.
Read more about this topic: Perennial Plant
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