First time gardeners and even those hardened, hoe-in-hand tilling veterans are sometimes plagued with doubt. Am I saving money growing my own green stuff? Or is gardening an expensive indulgence? Good news today from the Wall Street Journal. Columnist Neal Templin reports that yes, a garden saves you money. The trick? Keep capital costs low, says his source, Cornell University's Lori Bushway, who says you can "easily triple" your investment. Reap what you sow!