Caper. This shrubby perennial plant grows 3-5 feet high, with numerous branches, bearing a pair of hooked spines at the base of each leaf stalk. Flowers are about 2 inches in diameter, white with numerous violet stamens, and very pleasing in appearance. Plants grow well in nutrient poor sharply-drained gravelly soils. Capers are salt-tolerant and flourish along shores within sea-spray zones. Capers of commerce are immature flower buds which have been pickled in vinegar or preserved in granular salt.