Gardening Usda Plant Hardiness Zone Map

Gardeners have come to rely on usda hardiness zone maps to tell us what plants will survive locally. The usda hardiness zone map divides north america into 11 separate planting zones.

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Plants are often classified by the coldest temperature and zone they can endure.

Gardening usda plant hardiness zone map. Zone 1 is the coldest region and zone 11 is the warmest. It has been adapted by and to other countries. Basically a hardiness zone is a detailed map crafted to help you grow your garden.

Zones 2 to 10 are also subdivided into a or b giving a total of 20 zones or sub zones. The ones are based on the average lowest temperatures across the united states. Soil moisture humidity heat wind and other conditions also affect the viability of individual plants.

Each zone is based on the 30 year average of the single coldest temperature recorded each winter. The united states department of agriculture usda developed the map. What do the hardiness zones mean.

This divides the united states into 11 zones 1 11 characterised by their average minimum temperature. The majority of zone 1 is located in alaska. As a beginner gardener or farmer you need to know the hardiness zone in the area where you re planning to put up your garden.

With minimum average temperatures between 60 to 50 degrees f it can be a difficult zone for gardening. Usda plant hardiness zone 1 is the coldest zone designation for the united states. Plant zones are based on the average annual minimum temperature over a 30 year period not the lowest temperature the thermometer has ever hit but rather the.

The usda plant hardiness zone map is a valuable agricultural and horticultural reference. Zone 3 is 10 degrees f colder than zone 4 etc. In addition each zone is split in half.

Maine spans plant hardiness zones 3 6. The map is divided into thirteen distinct 10ºf zones which are. A hardiness zone is a geographic area defined to encompass a certain range of climatic conditions relevant to plant growth and survival.

The original and most widely used system developed by the united states department of agriculture usda as a rough guide for landscaping and gardening defines 13 zones by annual extreme minimum temperature. Plant hardiness zones are specific areas in which we identify which plants should thrive at a given location. The usda released updated plant hardiness zone maps for the united states in 2012.

Find your usda planting zone considered the standard measure of plant hardiness the usda plant hardiness zone map is based on average annual minimum winter temperatures. Each growing zone is 10 f warmer or colder in an average winter than the adjacent zone. If you see a hardiness zone in a gardening catalog or plant description chances are it refers to this usda map.

Often we are asked by plants users about the usda plant hardiness zone map but neither plants npdt nor the usda nrcs as a whole are responsible for this map. Early in 1990 the united states department of agriculture usda published an updated version of their map of plant hardiness zones.

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