Source: Magness et al. 1971
The caper-bush is a spiny, straggling vine-like shrub, up to 3 feet, with round to ovate, deciduous leaves. The capers of commerce are the unopened flower buds, which are picked daily. The youngest buds make the finest product. The buds are pickled in strong vinegar, and used as pickles or in sauce. Capers are produced commercially in Mediterranean countries, but not, so far as known, in the U.S.