Lowe's and Home Depot have taken up an annual rite of spring -- the battle to win over home gardeners by discovering and developing new plants shoppers can only find at their stores. This year, Home Depot has the exclusive on the "Stellar Blue" ageratum that requires less clipping, while only Lowe's offers the "Double Ballerina" African daisy. The average American household spent $63 on flowering plants last year, and for every dollar they spend on plants they spend $3 on hoses, shovels and other gardening tools.

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