3. Is 10,000 pounds or more, or is 10,000 or more cannabis plants, such person shall be sentenced to a mandatory minimum term of imprisonment of 15 calendar years and pay a fine of $200,000.
For the purpose of this paragraph, a plant, including, but not limited to, a seedling or cutting, is a "cannabis plant" if it has some readily observable evidence of root formation, such as root hairs. To determine if a piece or part of a cannabis plant severed from the cannabis plant is itself a cannabis plant, the severed piece or part must have some readily observable evidence of root formation, such as root hairs. Callous tissue is not readily observable evidence of root formation. The viability and sex of a plant and the fact that the plant may or may not be a dead harvested plant are not relevant in determining if the plant is a "cannabis plant" or in the charging of an offense under this paragraph. Upon conviction, the court shall impose the longest term of imprisonment provided for in this paragraph.