Plant Hardiness Zone(s)
There are seven plant hardiness zones spread throughout the state of Tennessee. They include zones 5a, 6a, 7a, 8a, 5b, 6b, and 7b. The majority of the state is located in the 7a hardiness zones with extreme minimum temperatures between 0 and 5 degrees Fahrenheit. Hemp flower grows very well in these generally mild zones and is capable of withstanding the colder extremes for days or weeks at a time.
Tennessee is located in a very temperate thermal zone. It has very mild winters and warm summers. However, it is a particularly large state with varying degrees of elevation. Areas near the Gulf Coastal Plain and the Sequatchie Valley are the warmest and have the best growing seasons for hemp flower. Average temperatures during the winter will be close to 40 degrees Fahrenheit while the summer average will be closer to 80 degrees Fahrenheit.
Length of Growing Season
he average annual rainfall is evenly dispersed across the state with slight variations from one city to the next. For example, Knoxville has an average annual rainfall of 47.9 inches. Monteagle is a city with a particularly high average of 62.7 inches. Other areas will generally fall somewhere between these two limits.
Average Annual Sunlight
Tennessee receives plenty of sunshine throughout the year. Cities like Nashville receive about 2,500 hours of sunlight with more than 100 days of the year considered “clear days”. A clear day is any day where clouds cover no more than 30 percent of the sky. This amount of sunlight is more than enough for hemp flower to survive and thrive.
Average Annual Precipitation
The average annual rainfall is evenly dispersed across the state with slight variations from one city to the next. For example, Knoxville has an average annual rainfall of 47.9 inches. Monteagle is a city with a particularly high average of 62.7 inches. Other areas will generally fall somewhere between these two limits.
Tennessee is a very mountainous state in some regions. The elevation ranges anywhere from 178 feet above sea level to 6,643 feet above sea level. Overall, the average elevation across the state is 900 feet above sea level. There are more mountains and thus increased elevation the further east you head.
Soil pH levels in Tennessee range anywhere from 4.5 to 7.5. Many regions in the state have highly acidic soil that can be problematic for many types of plants. However, hemp flower grows best in soil with pH levels at 6.0 or above. Most of the large growing regions will fall within this range.
Hemp flower is sensitive to soil compaction which is fairly common in Tennessee where much of the soil contains clay. Increased clay content can reduce the yield of the plant. That being said, it is still entirely possible to grow hemp in soil with this composition. It will just present a few challenges along the way.
There are a number of different fungi and viruses that can affect the hemp plant. Some of the most common pests include grey mold and white mold. There have even been some cases where pink mold has been seen growing on the roots of the hemp plant. Special care will need to be taken to protect against these unwanted pests.
Obtaining A Hemp Flower Grower’s License In Tennessee
Under federal law, it is illegal to grow hemp flower anywhere in the United States without first obtaining a grower’s license from the appropriate regulatory body for the state in which the interested party intends to plant the crop. For information on the legal status of hemp in Tennessee, as well as a breakdown of the application process, click here. Read about hemp legality by state.