DREAMS OF sunny flagstone terraces and outdoor kitchens might need to stay on Pinterest boards just a little longer. It’s tough to justify a landscape transformation given the one transpiring in your 401(k). A tighter budget doesn’t preclude a little indulgence, however, particularly one that will have long-lasting impact, cost a fragment of a typical garden renovation and do its bit to re-green the planet—the simple, luxurious act of planting a tree.

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