Large group of plants native to Europe and Asia grown for their showy, daisylike, yellow flowers. Imposing and erect, they have large basal leaves and progressively smaller leaves higher up on the stems. Medium green, oval, pointed leaves are often hairy or downy. Good for open, casual gardens or against a dark-colored background. Soil should be well drained. Deer resistant.
I. helenium. ELECAMPANE. Robust plant to 6 ft. tall, 3 ft. wide, with basal leaves 1122 ft. long. Blooms in summer, bearing single or clustered, bright yellow flowers to 3 in. across. Widely naturalized in the U.S. Root is used medicinally for respiratory complaints. Full sun or partial shade. Regular water.
I. magnifica. SUNRAY FLOWER. About the same size as I. helenium but with broader, rougher leaves. Clusters of up to 20 deep yellow, 6-in. flowers appear in late summer. Good plant for the back of the border. Excellent cut flower. Full sun. Regular to ample water; will grow in boggy soil.