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
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
The zone that would be most difficult for a plant to live in is the Benthic zone. It is the zone at the lowest level of a body of water.
Temperate.
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.
Buffer Zone (KP-1979) Postal code:75850
Swamp Zone, Floating Leaf Zone, Underwater Plant Zone and the bottom zone[whose name I am unsure of].
It tells you which plants can usually grow unprotected in your area. If you live in zone 6, and a plant you want to grow is hardy to zone 6, you can grow that plant unprotected all year. If its only hardy to zone 7, you need to protect it for the winter. In general, if a plant's hardiness zone is less than or equal your garden zone, it needs no protection. If greater, protect it.
Postal code of Buffer Zone(Karachi City):74000
Swamp Zone, Floating Leaf Zone, Underwater Plant Zone and the bottom zone[whose name I am unsure of].