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USDA / AHS plant hardiness zones (1960 version)

The map below has coloured areas corresponding to the United States Department of Agriculture plant hardiness zones.

Save it for future use.

European Map

You can use the form below to select plants by hardiness.

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Plant Hardiness Notes

Plant hardiness zones are useful as a guide but do not replace a good gardener's common sense. As Alf says "It's not just the cold that plants suffer from."

The chemical balance and textural consistancy of the soil, exposure, rainfall, humidity, light levels and wind will all play their parts.

Plants usually survive cold better in a drier situation than a wet one, deciduous plants fare better in more exposed situations, especially in areas with higher summer temperatures, evergreens prefer a more sheltered position, more humidity and cooler summers.

eMail Alf at B and T World SeedsIts not just the cold that plants suffer from !



Wind can damage plants not just by breaking branches or uprooting trees but also wind chill, increased leaf transpiration (water loss), industrial pollutants or sea salt carried by the wind, drying of the soil and by preventing beneficial insects from doing their work.

Tall plant's roots can also be damaged, restricting their water intake.

Sheltering your tender plants from the wind is always a good idea and hardy hedges are good for this. It has been found that the best windbreaks have about 50% permeability.

If you use a wall for protection remember that there will be turbulance downwind (although this can be significantly reduced by a baffle, such as plants growing on one or both sides) and that the side of a wall facing the sun will act as a heat trap.



European Map
Protecting your Seedlings from Birds and Frost
USDA Plant Hardiness Zone Map
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