The growing zone for Sierra Vista, AZ is 8. This basically means that a given plant can survive a minimum temperature of -12. This is also referred to as hardy to zone 8.
According to the USDA, the plant hardiness index for Spokane, WA is: 5b-6a
The name given to the dividing zone responsible for plants growing in width is the cambium layer. This layer is located between the xylem and phloem tissues in the stem of a plant, and it is responsible for producing new cells that allow the plant to grow in girth or width.
In physical geography, tundra is a biome (plant life) where the tree growth is hindered with low temperatures and short growing seasons
Zone 5a.
Zone 7
Temperate.
Buffer Zone (KP-1979) Postal code:75850
Area code 312 is located in the Central Time Zone.
Decide where you want to plant. Pay attention to what your growing zone is. The amount of sunlight and type of soil will help you decide what will grow at that site. Look at the plant tag. It will tell you how deep to plant and if it is a shade or sun plant. Water appropriately. You might ask at a gardening center what plants grow well in your area.
Postal code of Buffer Zone(Karachi City):74000
A plant hardiness zone indicates the climatic conditions of a specific area, primarily its minimum winter temperatures. Zones are typically numbered from 1 to 13, with each zone representing a range of temperatures, usually in 10°F increments. To read a hardiness zone, compare your location's zone to the recommended zones for the plants you wish to grow; if the plant's hardiness zone includes your area’s zone, it should thrive there. You can find hardiness zone maps through gardening resources or the USDA's plant hardiness zone map.
Swamp Zone, Floating Leaf Zone, Underwater Plant Zone and the bottom zone[whose name I am unsure of].