Planting Mixed Species
Question
Answer
Shalom!
Thank you for your question.
There is no ban on cross-breeding vegetables outside of the Land of Israel. The ban on cross-breeding (along with most other land applicable mitzvot) apply only in the land of Israel.
Our sages derive this unique exception to the ban on cross-breeding from the relevant verse itself. The verse says: "You shall not plant your field with mixed seed." Our sages derive from here that the words 'your field' refer only to a field in the land of Israel Israel as that is the only place in the world where the land belongs to us.
I will mention that if you live in the Land of Israel, there are different requirements in terms of required distance between seeds depending on the spicies. One must contact a rabbi directly.