Or HaChaim on Genesis 1:11/אור החיים על בראשית א׳:י״א

1And God said, "let the grass be put forth, etc.": The rabbis, of blessed memory, said (Chullin 60a) that even if the Creator said "according to its specie" only to the trees, the grasses brought up an a fortiori argument (kal vechomer), etc. [that they too should spring forth according to their own specie]. And [this] is difficult, since in the order of the verse, God had His words to the grasses precede [those to the trees]; and, if so, why did they delay from coming out immediately [and] exactly adjacent to the statement of God, until [after] God finished saying to bring forth trees, from which they raised the a fortiori argument? And according to what I have explained on the verse, "In the beginning" - that in every place that He speaks of a matter of strength with the name Elohim, He speaks the whole statement in one word; if so - there was no precedence [of the words] to the grasses before the tree.