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The minimum temperature for germination of barley is 34 degrees to 36 degrees F (1 degrees - 2 degrees C). After the seed takes up moisture, the primary root (radicle) emerges. The radicle grows downward, providing anchorage and absorbing water and nutrients, and eventually develops lateral branches.arley can be distinguished by differences in head type and growth habits. In a six-rowed barley, three kernels are formed at each node of the head while in a two-rowed type, only a single kernel forms at each node (figure 1). Barley is also classed by its requirement for cold temperatures.
Sowing seeds outdoors requires a knowledge of the seeds' optimum germinating temperature and minimum germinating temperature, according to a Texas A&M AgriLife Extension website article titled, Check Soil Temperature.. When soil is at the minimum temperature, the seeds' germination may be sporadic or slow. Waiting until soil warms to the optimum temperature introduces negative factors, such as a shorter growing season or less vigorous plants. The optimum temperature for lavender seed germination is 80 degrees Fahrenheit, and the minimum temperature is 40 degrees Fahrenheit. Therefore, for springtime sowing, the practical soil temperature for lavender seed germination is 50 to 60 degrees Fahrenheit.