Tosefta על תרומות 7:7

Planting untithed [seeds] is prohibited, as is covering up untithed [seeds with dirt], as well as making [a partnership] with a Gentile with [respect to planting] untithed [seeds]. A Jew who forgot and planted untithed [seeds], they are exempt before they sprout because [the seeds] have already perished (cf. Ter. 7:7). One who buys [produce] for livestock, for wild animals, and for fowl is exempt from Demai.