Tall White Bearded Iris. White flowers with yellow hafts. Irises prefer a full day of sun, but will grow and bloom well if given six or more hours of sunlight. The best time to plant is after the Iris has finished the bloom season and before it starts new growth. In most cases, this will be between July and October avoiding periods of temperature extremes. The ideal time is when the summer heat has ended and cooler fall weather arrives. This will ensure early root development. The bearded Iris is drought tolerant but will rot if too wet. Gardeners can avoid many problems by providing good drainage to protect the Iris from getting "wet feet".