What is the minimum separation required between two adjacent grain fields to avoid a kilayim violation?
Halachah 9 states that between two grain fields one must leave a separation the size of the area for sowing a quarter-kav — approximately ten and one fifth cubits by ten and one fifth cubits. The six-handbreadth square is the lesser standard that applies between vegetable fields (H10).
Question 2
According to Halachah 6, why are radishes and Israeli radishes considered kilayim with each other, even though their leaves and fruits look similar?
Halachah 6 explicitly states that radishes and Israeli radishes are kilayim 'because the taste of the fruits are drastically different from each other' — taste here serves as a visible marker of distinction that overrides the visual resemblance of leaves and fruits.
Question 3
What does Halachah 5 identify as the governing criterion for determining kilayim status between plants?
Halachah 5 states explicitly: 'with regard to kilayim we follow the appearance alone.' This principle explains why plants that are biologically two species but visually almost identical are not treated as kilayim, and vice versa.
Question 4
According to Halachah 14, when may Greek squash that has draped onto an adjacent species require uprooting, despite a valid separation having been made?
Halachah 14 carves out Greek squash as an exception to the general rule that draping after valid separation is permitted. Because Greek squash extends very far, when it drapes onto another species the plants appear visually mixed — so one must uproot the species in front of it, as explained in H13.
Question 5
Why does Halachah 17 permit sowing one row of flax between two adjacent wheat fields belonging to the same and a neighboring owner?
Halachah 17 explains that 'an observer knows that it is not the common practice to sow only one row of flax and this person is merely testing his field.' Since the flax is sown with intent to destroy rather than to benefit, it is 'sowing with intent to destroy' and the kilayim prohibition does not apply.