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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.
Collard seeds germinate well in a range of soil temperatures, from 45 to 85 degrees Fahrenheit. Indoors, a temperature between 60 and 70 degrees provides optimum germination conditions.The soil must remain moist throughout the sprouting period.ermination Requirements. Collard seeds germinate well in a range of soil temperatures, from 45 to 85 degrees Fahrenheit. Indoors, a temperature between 60 and 70 degrees provides optimum germination conditions. The soil must remain moist throughout the sprouting period.