Tafsir Scholars & Arabic Linguists - Lawaqih Meaning in 15-22

How did the classical mufassirun understand "lawaqih" in 15:22? Clouds, trees, or both? I've been reading around Al-Hijr 15:22: "And We send the winds as fertilizers (lawaqih), then send down water from the sky and give it to you to drink..." (translation of the meaning) In Ibn Kathir I found two readings side by side. He narrates from Ibn Mas'ud (and says Ibn Abbas, an-Nakha'i and Qatadah held the same view) that the wind fertilizes the clouds until they pour rain, like milk from a pregnant camel. His own summary covers both: the winds fertilize the clouds so they rain, and fertilize the trees so they open into leaves and blossoms. He also quotes Ubayd ibn Umayr describing a series of winds, the last of which pollinates the trees, and then Ubayd recites this ayah. What strikes me is that the tree reading was already there centuries before botany formally described wind pollination. Sprengel's work is usually dated to 1793. About one in ten flowering plant species is wind-pollinated today, along with nearly all conifers. To be clear, I'm not saying this is some knockdown proof. The Arabs already hand-pollinated date palms (there's the report in Sahih Muslim about the people of Madinah doing it), so the root l-q-h was familiar vocabulary. To me it reads more as a sign than an argument. Full disclosure: I write for onegodpath.com, and I've been working on a piece about this ayah. But I'm asking here because I'd like to go deeper than Ibn Kathir: Does anyone know how al-Tabari or al-Qurtubi handle lawaqih? Do they favor one reading? Is there any discussion of the grammar, lawaqih as "fertilizing" vs. "fertilized" (i.e. winds laden with rain)? JazakAllahu khayran for any pointers.