Mischna zu Demai 5:17

[Seed sown in a] perforated flowerpot, prohibits [as kilayim] in a vineyard. [In] one not perforated, does not prohibit [as kilayim]. Rabbi Shimon says: both are forbidden but neither prohibits. One who carries a perforated flowerpot through a vineyard, if [that which is sown in it] grows a two-hundredth part, it is forbidden.