Silverhill Seeds: Instructions

USDA hardiness zones:

In the plant descriptions in the catalogue, reference is made to the USDA Zones. Here is a list of the Zones and the temperatures to which they refer. If for example we have described a plant as USDA Zone 7, this means that the plant can probably tolerate temperatures to about -18°C

Zone 6: -10 to 0°F or -23 to -18°C;

Zone 7: 0 to 10°F or -18 to -12°C ;

Zone 8: 10 to 20°F or -12 to -7°C;

Zone 9: 20 to 30°F or -7 to -1°C;

Zone 10: 30 to 40°F or -1 to 4°C;

Zone 11: above 40°F or above 4°C.

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