Editor’s note: This tour of small businesses across the country highlights the imagination, diversity, and resilience of American enterprise. Biodiversity sounds so environmentally correct that one forgets it is also beautiful. Cradled by the gently looming Blue Ridge Mountains, the farm at Gaia Herbs is a glorious quilt. The electric purple of violet skullcap. The saturated orange of California poppies. The delicate lavender of blue vervain. The pink and red sunburst of echinacea. Gaia’s founder,…