In what is a fascinating and beautifully researched story, “The Brother Gardeners: Botany, Empire and the Birth of An Obsession (Knopf, $35)” by acclaimed garden historian Andrea Wulf, is sure to appeal to regional history buffs. It’s the story of a garden revolution that began in America in 1733, when the farmer John Bartram dispatched two wooden boxes of plants and seeds from Philadelphia, addressed to London cloth merchant Peter Collinson. That correspondence was the beginning of the most important horticultural friendship of the 18th century. For the next 40 years, Bartram and Collinson transported America’s evergreens, magnificent trees and colorful shrubs to England, transforming the English garden and parkland into a new multicolored landscape. In other words, the seeds for the English love affair with gardens were literally sowed in Philly. “The story begins in January 1734, when Collinson receives a box of seeds and cuttings that Bartram sent from Philadelphia — the first of many hundreds that would cross the ocean over the next decades,” explained Wulf. “Together they introduced more than 200 new species to Britain, but their greatest achievement was the scale of the plant enterprise — the sheer quantities of seeds. By the end of the 18th century, plants that had only been grown as choice rarities in a few botanic collections at the beginning of the century had become so common that they were available cheaply in nurseries from London to Yorkshire."