Like Bearded irises, Siberian irises should be planted on a ridge or mound, with the roots spread down the mound. Leave no air pockets under the rhizome when the soil is filled in and firmed down. Encircle each plant with a well to help retain water. Water thoroughly and do not allow newly planted Siberians to become dry. Cultivate to control weeds and clear away garden debris.
Mulches are very helpful, especially during prolonged dry periods.
When the foliage has died back in the fall, cut it back close to the ground. Although seed pods are decorative, both in the later summer garden and in arrangements, any unwanted pods should be removed before the seeds have ripened. Seeds from one plant may be deposited near another plant, making it difficult to identify the parent of the emerging seedlings. Winter protection is not necessary except for newly planted divisions. To Listing of Siberian irises To Cultivation instructions for Japanese irises .