he missed it as the time he had on his watch was not the same as the local time. The story goes that Sir Sandford Fleming was trying to catch a train in 1876. Where Does The Time Change in Tennessee on Interstate 40? The official lines may be straight but people have a way of messing up a good thing. While this is the official time in the country, many ethnic groups in the country use the 15-degree boundaries to promote their ethnic pride. The country used to have 5 time zones but Mao decided that to promote national unity, the whole country should be set to Beijing time. Sometimes those leaders ignore the time zone boundaries and make their country just one instead of 5. However, due to politics and the wishes of different governments in different countries, those lines are drawn to fit what the leaders of those countries want. Each boundary is one hour apart from the other so the time zones are very accurate in their ideal state. These lines are 15 degrees latitude apart from each other.Īnd if you are not sure what 15 degrees latitude refers to, that is the distance between each line. All the true time zones are very straight lines. The sun does not jump back and forth in the sky to make life weird for people. Visit to learn more.Technically, they are not crooked. The Gardens are a project of the UT Institute of Agriculture, with locations in Knoxville and Jackson. Sue Hamilton is director of the UT Gardens and an associate professor on the faculty of the University of Tennessee Department of Plant Sciences. If you are interested in learning more about the history and development of the map, noted horticulturist Tony Avent of Plant Delights Nursery offers a wonderful in-depth and thorough article.ĭr. Similarly, exceptionally warm weather in midwinter followed by a sharp change to seasonably cold weather may injure plants as well.īe aware that the hardiness zone map is a great guide, but only a guide – and only when the zones assigned to plants by producers are accurate. We aren’t surprised by a bout of extremely cold weather early in the fall that may injure plants even though the temperatures may not reach the average lowest temperature for our zone. For Tennessee gardeners, this means our plants may not always acquire a gradual transitioning from fall to winter or winter to spring. Keep in mind, too, that Tennessee is in the Mid-South, meaning the “transition zone” between the North and the deep South. Individual gardens may even have localized microclimates that may be warmer or cooler than the general zone for your area, so no hardiness zone map can take the place of the detailed knowledge that gardeners pick up about their own gardens through hands-on experience. Growing plants can be very complex, and many environmental factors can impact the winter hardiness of a plant – wind, soil type, soil moisture, humidity, pollution, snow and winter sunshine to name a few. Zone hardiness is a handy thing to know, but don’t be frustrated when a plant dies, and certainly don’t give up trying to grow that particular plant again. The map website also incorporates a function that allows gardeners to find their zone by ZIP code. Each zone is a 10-degree Fahrenheit band, further divided into 5-degree Fahrenheit zones “A” and “B.” The new map – jointly developed by USDA’s Agricultural Research Service (ARS) and Oregon State University’s (OSU) PRISM Climate Group – is available online at For the first time, the USDA zone map offers a Geographic Information System (GIS)-based interactive format and is specifically designed to be Internet-friendly. The USDA zone map had not been updated since 1990, and the new version of the map includes 13 zones, with the addition for the first time of zones 12 (50-60 degrees Fahrenheit) and 13 (60-70 degrees Fahrenheit). While the zones do represent the average annual extreme minimum temperatures at a given location during a 30-year period in the past, they do not reflect the coldest it has ever been or ever will be at a specific location. The USDA Plant Hardiness Zone Map is based on the average annual minimum winter temperature. Even though 2012 was an unusually warm winter for much of the United States, low temperature during the winter is a crucial factor in the survival of plants at specific locations.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |