(And We send the winds fertilizing.) i.e., fertilizing the clouds so that they give rain, and fertilizing the trees so that they open their leaves and blossoms.
The winds are mentioned here in the plural form because they give results, unlike the barren wind (Ar-Rih Al-‘Aqim, see Adh-Dhariyat 51:41), which is mentioned in the singular and described as barren since it does not produce anything; because results can only be produced when there are two or more things.
﴿وَأَرْسَلْنَا الرِّيَاحَ لَوَاقِحَ﴾
(And We sent the winds fertilizing.) `Abdullah bin Mas`ud said, “The wind is sent bearing water from the sky, then it fertilizes the clouds until the rain begins to generously fall, just as the milk of the pregnant camel flows generously.” This was also the opinion of Ibn `Abbas, Ibrahim An-Nakha`i and Qatadah. Ad-Dahhak said: “Allah sends it to the clouds and it gets fertilized and becomes full of water.” `Ubayd bin `Umayr Al-Laythi said: “Allah sends the wind which stirs up the earth, then Allah sends the wind which raises clouds, then Allah sends the wind which forms clouds, then Allah sends the fertilizing wind which pollinates the trees. Then he recited,
﴿وَأَرْسَلْنَا الرِّيَاحَ لَوَاقِحَ﴾
(And We sent the winds fertilizing,)
