By Joshua Siskin, Garden ColumnistPosted: 07/10/2011 01:00:00 AM PDT Caper bush (Capparis spinosa) features unopened flower buds or capers that grow diagonally along the stem beneath the flowers. (Joshua Siskin/Special to the Daily News) The sizzling heat we have just experienced may leave you wondering if there is anything except for cactus, bougainvillea and certain native plants that can survive such weather without serious pampering. Curiously, there is an infrequently encountered yet edible garden beauty, a long-flowering, leafy perennial that withstands bristling heat just fine. It's none other than the caper bush (Capparis spinosa). The unopened, pickled flower buds of this plant...
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