Kilayim 7:7-8

Kilayim 7:7

If the wind blows grape vines over where grain is growing, the owner must immediately separate them with a fence. If circumstances prevented him from doing so, the crops remain permitted. If grain or vegetables turned to grow under grape vines, he must turn back the growth and the crops remain permitted. Grain planted in a vineyard becomes prohibited when it takes root; grapes render grain prohibited when they have gotten as big as white beans. Grain that has been completely dried and grapes that have not ripened sufficiently do not become prohibited.

Kilayim 7:8

A crop planted in a pot with a hole in the bottom placed in a vineyard can render produce prohibited; one without a hole does not. Rabbi Shimon says that one may not place either of these in a vineyard but that they do not render produce prohibited. If a person carries a pot with a hole through a vineyard without placing it down, if the crop increased by 1/200, it becomes prohibited.