garner in
To harvest or gather something and store it in some place or thing. A noun or pronoun can be used between "garner" and "in." I spent my youth garnering in crops on my grandparents' farm.
garner something in
and garner something upto take something in and store it; to harvest something in and store it. (Originally referred to grain stored in a granary.) Will they garner the crop in on time this year? They had garnered in the entire crop by late October.