Kilayim 2:5-6

Kilayim 2:5

If one’s field was planted with caraway or arum (a genus of flowering plant), he may not plant on top of them because they can take up to three years for some to sprout. If some herbs sprouted among one’s grain, or if several species sprouted in a threshing floor, or if various species sprouted among one’s fenugreek – in all of these cases, he need not remove them. (Kilayim only applies when both species are desirable. In these cases, the invading species are actually injurious to his crop.) If he chooses to remove or cut them, he must get rid of everything except for the one thing he actually planted. (If he removes some but not others, he clearly desires the ones that remain and they would therefore be kilayim.)

Kilayim 2:6

If one wants to organize his field into a number of beds, each with a different species, Beis Shammai say the distance in between them must be as wide as three plowed furrows; Beis Hillel say it must be as wide as a yoke used in Sharon (which is wider than the yokes used elsewhere). These two measurements are about the same.