An icy mixture of rain and sleet fell on the glass roof of Greenhouse Two at Backyard Farms here, but as its big blue door slid open and the warm, green, celery smell of tomato plants wafted out, it was summer.
When it was built three years ago, the companys first 24-acre greenhouse in Madison was already the largest building in Maine. This second connected greenhouse, completed last year, brought the total area under glass to some 42 acres, or roughly the size of 32 football fields. Even in the depths of winter, a million tomatoes ripen indoors to harvest each week, snipped from their vines by workers in T-shirts and shorts.
Its medium sized, said Tim de Kok, one of the companys head growers. At his last job, Mr. de Kok managed a 40-acre chunk of a 318-acre monster in Arizona. The center of Canadas greenhouse industry, the area around Leamington, Ontario, has some 1,600 covered acres, roughly equivalent to putting Manhattan, south of Houston Street, under glass.
Once, if you wanted tomatoes out of season, you mainly had to settle for hard pink ones picked green in the fields of Florida or Mexico and shipped by truck. Commercial greenhouses could do better, but they were a niche market.
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