Areas derived by the USDA that indicate average-low winter temperatures. Used as a plant hardiness indicator. Other plant hardiness zones developed by other entities use different numbering systems. Related Images:
Archives
USDA zones
Areas derived by the USDA that indicate average-low winter temperatures. Used as a plant hardiness indicator. Other plant hardiness zones developed by other entities use different numbering systems. Related Images:
Tender
Not tolerant of frost and cold temperatures. In horticulture, tender does not mean weak or susceptible to insect pests or diseases. Related Images:
Thermoperiod
The change in temperature from day to night. Related Images:
Senescence
The aging process. Also used to describe a plant that is in the process of going dormant for the season, although technically only the parts that are dying (the leaves) are becoming senescent. Related Images:
Relative humidity
The percentage of moisture saturating the air at a given temperature. The ratio of water vapor in the air to the amount of water the air could hold at the current temperature and pressure. Related Images:
Microclimate
Climate affected by landscape, structures, or other unique factors in a particular immediate area. Related Images:
Leaf scorch
Damage to a leaf, due to adverse environmental conditions such as high temperatures, that causes rapid water loss resulting in dead tissue. Related Images: