Silverhill Seeds -- South African Seed Specialists

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The Cape Orchids: A regional monograph of the orchids of the Cape Floristic Region Volumes 1 and 2

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 -18C

Zone 6: -10 to 0F or -23 to -18C;

Zone 7: 0 to 10F or -18 to -12C ;

Zone 8: 10 to 20F or -12 to -7C;

Zone 9: 20 to 30F or -7 to -1C;

Zone 10: 30 to 40F or -1 to 4C;

Zone 11: above 40F or above 4C.


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