close up of a large, green prickly pear cactus with a profusion of yellow flowers, buds and fruit in milwaukee, wisconsin

optunia prickly pear cactus leaves pads reproducing botany botanical horizontal horticulture nature plant green cactaceae desert spring mitchell park horticultural conservatory domes milwaukee wisconsin usa conservation dome flowers blooming blooms buds seasonal spines beauty sunny yellow architecture geodesic fruit texture travel sight close large profusion