English: “The fullness of the seed” — from when does the seed become forbidden? From the time it takes root. And grapes — from when they reach the size of a white bean.
On the daf / in context: The midrash fixes the moment the prohibition takes effect for seed crops (rooting) and for grapes (size of a white bean).
Type of Learning
Definitional derash establishing the onset of the issur.
What Is Learned
Kilayim of grain becomes forbidden at rooting; grapes of kilayim become forbidden when they reach the size of a white bean.