a purple and green prickly pear cactus with yellow flowers and buds nestled with a fairy duster plant

spineless optunia prickly pear cactus leaves reproducing botany botanical horizontal horticulture nature plant green light cactaceae pads desert spring mitchell park horticultural conservatory domes milwaukee wisconsin usa conservation dome flowers blooming blooms buds seasonal fairy duster calliandra eriophylla leguminosae spines beauty sunny purple yellow nestled