Bearded iris grow best in well-drained soil. Sloped or raised beds help ensure good drainage. Coarse sand or humus may be added to improve drainage. The ideal soil pH is 6.8 (slightly acidic). Iris do best with at least 6 hours a day of full sun.
When to Plant
For best results, iris should be planted at least six weeks before the first hard frost in your area.
Plant iris so the tops of the rhizomes are exposed and the roots are spread out facing downward into the soil. A common mistake is to plant bearded iris too deep. Bearded iris planted 12 to 24 inches apart will require less frequent thinning