Tracing a sugia... on the specifics of tithing produce that takes root before Rosh Hashanah, and the question of tithing produce that is "mixed." Can the produce be combined for the purpose of tithing? Which question opens up reason to delve into Shmuel's position, and that of R. Shimon Shezuri. For example, how solids and liquids may not be the same with regard to mixtures. Also, the new year for the trees! When does the winter season really begin? Plus, the story of an etrog that was picked at such a time that 2 tithings were reasonable. In accord with both sides of the machloket re the new year for trees. In what ways are etrogim akin to both trees and vegetables?