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A POTTED MUM from the hardware store. An ornamental kale. A warty pumpkin parked on mulch. This is the unholy trinity of post-Halloween garden design, according to flower farmer and floral arranger Michael Russo, of Trout Lily Farm in Guilford, Conn. We gardeners display the mum-kale-gourd trio, however cliché, because all the perfumed, showy flowers have died—or they’re spending the bitter winter retiring to Miami Beach.

But what…