<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> A hardiness zone is a geographically defined area in which a specific category of plant life is capable of growing, as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone (see the scale on the right or the table below). For example, a plant that is described as "hardy to zone 10" means that the plant can withstand a minimum temperature of − 1 ° C (30 ° F) to 3.9 ° C (39.0 ° F). First developed by the United States Department of Agriculture (USDA) as a rough guide to landscaping and gardening, the use of the zones has been adopted by other countries . </P> <Table> <Tr> <Td_colspan="2"> Zone </Td> <Td> From </Td> <Td> To </Td> </Tr> <Tr> <Td> 0 </Td> <Td> </Td> <Td_colspan="2"> <− 53.9 ° C (− 65 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 53.9 ° C (− 65 ° F) </Td> <Td> − 51.1 ° C (− 60 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> − 51.1 ° C (− 60 ° F) </Td> <Td> − 48.3 ° C (− 55 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 48.3 ° C (− 55 ° F) </Td> <Td> − 45.6 ° C (− 50 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> − 45.6 ° C (− 50 ° F) </Td> <Td> − 42.8 ° C (− 45 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 42.8 ° C (− 45 ° F) </Td> <Td> − 40 ° C (− 40 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> − 40 ° C (− 40 ° F) </Td> <Td> − 37.2 ° C (− 35 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 37.2 ° C (− 35 ° F) </Td> <Td> − 34.4 ° C (− 30 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> − 34.4 ° C (− 30 ° F) </Td> <Td> − 31.7 ° C (− 25 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 31.7 ° C (− 25 ° F) </Td> <Td> − 28.9 ° C (− 20 ° F) </Td> </Tr> <Tr> <Td> 5 </Td> <Td> </Td> <Td> − 28.9 ° C (− 20 ° F) </Td> <Td> − 26.1 ° C (− 15 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 26.1 ° C (− 15 ° F) </Td> <Td> − 23.3 ° C (− 10 ° F) </Td> </Tr> <Tr> <Td> 6 </Td> <Td> </Td> <Td> − 23.3 ° C (− 10 ° F) </Td> <Td> − 20.6 ° C (− 5 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 20.6 ° C (− 5 ° F) </Td> <Td> − 17.8 ° C (0 ° F) </Td> </Tr> <Tr> <Td> 7 </Td> <Td> </Td> <Td> − 17.8 ° C (0 ° F) </Td> <Td> − 15 ° C (5 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 15 ° C (5 ° F) </Td> <Td> − 12.2 ° C (10 ° F) </Td> </Tr> <Tr> <Td> 8 </Td> <Td> </Td> <Td> − 12.2 ° C (10 ° F) </Td> <Td> − 9.4 ° C (15 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 9.4 ° C (15 ° F) </Td> <Td> − 6.7 ° C (20 ° F) </Td> </Tr> <Tr> <Td> 9 </Td> <Td> </Td> <Td> − 6.7 ° C (20 ° F) </Td> <Td> − 3.9 ° C (25 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> − 3.9 ° C (25 ° F) </Td> <Td> − 1.1 ° C (30 ° F) </Td> </Tr> <Tr> <Td> 10 </Td> <Td> </Td> <Td> − 1.1 ° C (30 ° F) </Td> <Td> + 1.7 ° C (35 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> + 1.7 ° C (35 ° F) </Td> <Td> + 4.4 ° C (40 ° F) </Td> </Tr> <Tr> <Td> 11 </Td> <Td> </Td> <Td> + 4.4 ° C (40 ° F) </Td> <Td> + 7.2 ° C (45 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td> + 7.2 ° C (45 ° F) </Td> <Td> + 10 ° C (50 ° F) </Td> </Tr> <Tr> <Td> 12 </Td> <Td> </Td> <Td> + 10 ° C (50 ° F) </Td> <Td> + 12.8 ° C (55 ° F) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="2">> + 12.8 ° C (55 ° F) </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Zone </Td> <Td> From </Td> <Td> To </Td> </Tr>

What is the lowest temperature for zone 8