Tosefta sobre Jeremías 32:14

Rabbi Yehuda says, the Shevi'it of the Persian figs is in the second year [of the agricultural cycle], since they ripen every two years (Sheviit 5:1). They said to him, behold, they grow near you in Tiberias, and they always bear fruit once a year. One who buries luf [in the soil] during Shevi'it (Sheviit 5:2), Rebbi says, it is customary to bury it in a perforated pot so that it does not sprout. Even though there is no proof of the matter, there is a hint of the matter, as it says (Jer. 32:14), "And put them in an earthenware vessel, so that they may last a long time."