ZONE 7 
Zone 7 spread to over 20 US states, reflecting a diversity in environments and climates. This typical feature allows a wide range of plants to be cultivated in zone 7. However, it also means that there are often other considerations to be made to address issues such as soil conditions or drought tolerance.
Typical states in zone 7: Oklahoma, Texas, New Mexico, Oregon, Virginia.
WHAT TYPES OF SUCCULENT THRIVE IN ZONE 7?
With a mild winter, the lowest temperature in zone 7 falls between 0 to 10 degree F. Many types of succulents such as Ghost plant, Sedum and most Sempervivum can perform well in such weather.
ZONE 8
Zone 8 cover a majority of US southern coastal regions. Regarded as one of the warmest zones with a minimum degree of 10-20 degree F, states in zone 8 are cultivation lands to various types of succulents. 
Typical states in zone 8: Georgia, Mississippi , Texas, Louisiana, Alabama, South and North Carolina.
WHAT TYPES OF SUCCULENT THRIVE IN ZONE 8?
 
Succulent hardy to zone 8 should enjoy a mild winter and hot summer. Such succulents can be Cactus, Sedum, Sempervivum and some Echeveria.
See more about Choosing Succulents for Zone 3,4,5 & 6 - New York, Pennsylvania, Ohio and Minnesota
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