Amazon’s next ideas for growing its grocery business could blur the lines between Whole Foods and Amazon Fresh by enmeshing the two businesses’ fulfillment networks in a new set of experiments, according to The Wall Street Journal.

Amazon has reportedly started shipping Whole Foods products from 26 Amazon Fresh fulfillment centers and plans to build a microfulfillment center at a Pennsylvania Whole Foods Market and stocking it with Amazon Fresh household goods and groceries. Another part…