וַתּוֹצֵ֨א הָאָ֜רֶץ דֶּ֠שֶׁא עֵ֣שֶׂב מַזְרִ֤יעַ זֶ֙רַע֙ לְמִינֵ֔הוּ וְעֵ֧ץ עֹֽשֶׂה־פְּרִ֛י אֲשֶׁ֥ר זַרְעוֹ־ב֖וֹ לְמִינֵ֑הוּ וַיַּ֥רְא אֱלֹהִ֖ים כִּי־טֽוֹב׃
於是地長出了青草，就是結種子的菜蔬，各從其類，和結果子的樹木，果子裡面有種子，各從其類。上帝看這是好的。
Rashi
ותוצא הארץ וגו AND THE EARTH BROUGHT FORTH etc. — Although the expression למינהו according to its kind, was not used when the various kinds of herbage were bidden to come forth, they heard that the trees were so commanded and they applied to themselves the argument à fortiore (ק"ו), as it is explained in an Aggadic passage in (Chullin 60a).
Ramban
AND G-D SAW THAT IT WAS GOOD. This affirms the existence of the various kinds forever.
There was no special day assigned for this command for vegetation alone, since it is not a unique work. The earth, whether it brings forth anything or is salt land, is one.
There was no special day assigned for this command for vegetation alone, since it is not a unique work. The earth, whether it brings forth anything or is salt land, is one.
Radak
ותוצא הארץ, had the Torah written [in verbatim response to G’d’s directive]ותדשא הארץ , I would not have known that it was only one, as we explained on verse 11. The Torah wanted to make sure that we did not get the impression that the earth suddenly proliferated with a carpet of herbs. The remarkable thing was that although the earth produced only a single herb, ויהי כן, it endured, i.e. survived until it had many others added after the sun had become strong on the fourth day.
Alternatively, the meaning of this formulation is that from this moment on the earth always produced all these kinds of plants in their unadulterated form, each true to its species. There never was an occasion when nature suddenly produced a tree combining the properties of two different species. This only happened when man deliberately introduced an additional species through grafting it onto a tree. This is the reason why G’d commanded man not to crossbreed plants or animals. Both Adam and Noach were commanded this as our sages (Sanhedrin 60) state in conjunction with the verseאת חקותי תשמרו בהמתך לא ים, שדך לא תזרע כלאים, “do not crossbreed animals, nor seed your field with a mixture of more than one seed (trees).” (Leviticus 19,19). This referred to statutes G’d had already promulgated prior to the revelation at Mount Sinai. Concerning the mixing of seeds of herbs, no such prohibition exists for gentiles. Concerning the uprooting of such hybrids gentiles are not commanded to do this, and even Israelites are only obliged to do this in the Land of Israel. The entire subject revolves around deliberately upsetting the way in which G’d created His universe.[in the Sefer Hachinuch the applicability of part of this legislation to gentiles is described as מפי הקבלה, “based on tradition.” Ed.]
This is also why a scholar questioned what the halachah is according to Rabbi Chanina bar Pappa who had quoted the herbs arriving at the conclusion that they must maintain the purity of their species although the Torah had not written anything about למינו in connection with the herbs. The scholar wanted to know what the situation would be if someone had deliberately crossbred two species of herbs. According to the opinion of Ravina one could not hold such a person culpable for such an innovation. Alternatively, the question it that seeing that the herbs had voluntarily taken it upon themselves to maintain the same standards as did the trees and plants which carried their seed in them, would anyone violating that standard be held responsible for violating a law of nature which G’d had approved even though it was instigated by nature itself? The question was left open.
Alternatively, the meaning of this formulation is that from this moment on the earth always produced all these kinds of plants in their unadulterated form, each true to its species. There never was an occasion when nature suddenly produced a tree combining the properties of two different species. This only happened when man deliberately introduced an additional species through grafting it onto a tree. This is the reason why G’d commanded man not to crossbreed plants or animals. Both Adam and Noach were commanded this as our sages (Sanhedrin 60) state in conjunction with the verseאת חקותי תשמרו בהמתך לא ים, שדך לא תזרע כלאים, “do not crossbreed animals, nor seed your field with a mixture of more than one seed (trees).” (Leviticus 19,19). This referred to statutes G’d had already promulgated prior to the revelation at Mount Sinai. Concerning the mixing of seeds of herbs, no such prohibition exists for gentiles. Concerning the uprooting of such hybrids gentiles are not commanded to do this, and even Israelites are only obliged to do this in the Land of Israel. The entire subject revolves around deliberately upsetting the way in which G’d created His universe.[in the Sefer Hachinuch the applicability of part of this legislation to gentiles is described as מפי הקבלה, “based on tradition.” Ed.]
This is also why a scholar questioned what the halachah is according to Rabbi Chanina bar Pappa who had quoted the herbs arriving at the conclusion that they must maintain the purity of their species although the Torah had not written anything about למינו in connection with the herbs. The scholar wanted to know what the situation would be if someone had deliberately crossbred two species of herbs. According to the opinion of Ravina one could not hold such a person culpable for such an innovation. Alternatively, the question it that seeing that the herbs had voluntarily taken it upon themselves to maintain the same standards as did the trees and plants which carried their seed in them, would anyone violating that standard be held responsible for violating a law of nature which G’d had approved even though it was instigated by nature itself? The question was left open.