Mishnayos Kilayim Perek 2 Mishnah 4

[His field was] sown [with grain, or pulse, or garden-seed], and he changed his mind and decided to plant it [with vines], he may not say: “First I shall plant [the vines] and then turn [the soil],” but he must [first] turn [the soil] and then he may plant [the vines]. [If it was] ‘planted’ [with vines] and he changed his mind and decided to seed [with grain, pulse or garden-seed], he may not say: “First I shall sow [the grain etc.] and then I uproot [the vines],” but he must [first] uproot [the vines] and then he may sow [the grain etc.] If he wants, he may cut down [the vines] to less than a handbreadth [above ground], and then he may sow [the grain] and later, he uproots [the vines].

זְרוּעָה וְנִמְלַךְ לְנָטְעָהּ, לֹא יֹאמַר אֶטַּע וְאַחַר כָּךְ אוֹפָךְ, אֶלָּא הוֹפֵךְ וְאַחַר כָּךְ נוֹטֵעַ. נְטוּעָה וְנִמְלַךְ לְזָרְעָהּ, לֹא יֹאמַר אֶזְרַע וְאַחַר כָּךְ אֲשָׁרֵשׁ, אֶלָּא מְשָׁרֵשׁ וְאַחַר כָּךְ זוֹרֵעַ. אִם רָצָה, גּוֹמֵם עַד פָּחוֹת מִטֶּפַח, זוֹרֵעַ, וְאַחַר כָּךְ מְשָׁרֵשׁ: