The shape of your pollinator garden matters more than its size.
Most native bees have small foraging ranges. Peer-reviewed research on solitary bees found female flight distances of just 73 to 121 meters from the nest. A small bee born in your neighbor's yard might not reliably reach a flower patch in the middle of your yard if there's a length of mowed grass between them.
What works is linear pollinator habitat. A strip along a fence line, a corridor along the driveway, or a narrow band of natives running the full length of the property is best.
A 2018 study in the journal Ecography found that the length of linear semi-natural habitat was the single strongest predictor of wild bee species richness and connectivity in agricultural landscapes. Bees track edges.
A 2-foot-wide strip running 50 feet does more ecological work than a 10x10 island in the middle of the lawn. The strip gives pollinators a route to follow, something that guides their movement across the landscape.
The effect multiplies when your neighbors do the same. A strip along your fence meets a strip along theirs, and so on.