Irises are a beautiful addition to any garden, and planting them in Minnesota is no exception. To ensure your irises bloom in early spring, it's important to plant them correctly. This guide will provide you with all the information you need to know about planting irises in Minnesota. When planting irises, it's important to follow the instructions provided on the bulb package.
Generally, bulbs should be planted two to three times deeper than their diameter. This will vary depending on the type of soil. To prepare the soil, till it with a garden tiller to a depth of 8 to 10 inches and remove any roots, rocks, and other debris. Break up clods of dirt with a hoe or shovel and then plant the bulbs 3 to 4 inches deep, just below the soil surface.
For the best effect, group 6 dwarf iris bulbs per square foot. When shopping for iris bulbs or rhizomes, you'll likely find some for sale at your local garden store depending on the season. Resistant bulbs or bulbs that bloom in spring require a cold period to break their dormancy and begin the development of spring flowers. To keep your irises healthy and blooming, it's important to water them deeply every 3 or 4 weeks during periods of drought (longer than three or four weeks).
Additionally, fertilize your irises in early spring about 6 to 8 weeks before flowering and again after the flowers have disappeared. To prevent future problems with iris borers, properly trim and clean your iris plants in the fall. The University of Minnesota Extension provides detailed instructions on how to identify iris borers when inspecting your plants in spring and summer. If you're ready to bring the elegant perennial beauty of lilies to your garden, you can order many types of iris flowers online.
The rhizome-type iris produces larger flowers and includes bearded and beardless flowers, while the bulb-type iris produces smaller flowers and is often used in rock gardens or in the front row of borders to provide color early in the year. To extend the flowering season, plant more than one cultivar.