FORTUNE — The employee gardens at Timberland’s Stratham, N.H., headquarters are eating up the lawns and sprouting new sections. Fruit trees were planted in a roundabout in front last fall, and a big arbor for native grape varieties will go in sometime this year. Next year, the shady patch behind Timberland’s leased offices could become a blueberry patch.

“We’re going to run out of space pretty quickly,” says Betsy Blaisdell, senior manager of environmental stewardship at Timberland (TBL), maker of boots, shoes and other outdoor gear.

Space may be sparse, but enthusiasm runs high for Timberland’s Victory Garden, and for the overall concept. Corporate-backed employee gardens are growing like weeds, experts say, with small firms and Fortune 500 companies both buying topsoil and seeds.

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