She was sitting there one afternoon in early June. The sun was coming in at the window warm and bright; the orchard on the slope below the house was in a bridal flush of pinky-white bloom, hummed over by a myriad of bees. Thomas Lynde—a meek little man whom Avonlea people called "Rachel Lynde's husband"—was sowing his late turnip seed on the hill field beyond the barn; and Matthew Cuthbert ought to have been sowing his on the big red brook field away over by Green Gables.
-- L. M. Montgomery, Anne of Green Gables
What does over mean? (I guess over has two possibility: (1) over the orchard - vertically upward; horizontally from here to there, (2) all sounds are drowned because of the bees’ humming.)