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These sources examine whether planting forbidden species mixtures and immediately removing them violates the prohibition of kilayim. The Rambam and Shulchan Arukh establish that the act of sowing itself constitutes the transgression, independent of what happens to the plants afterward.
כִּי בִכְלַל מַה שֶּׁנֶּאֱמַר שָׂדְךָ לֹא תִזְרַע כִּלְאָיִם