Irises are among the most beautiful cultivated flowers, adding a touch of refined elegance to the garden with their large, intricate flowers in a rainbow of colors. When it comes to pruning potted iris plants grown in Minnesota, there are a few things to keep in mind. The best time to divide lilies is 6 to 8 weeks after the flowering season, usually in July or August. The clumps can be diluted by removing the centers of the clusters, leaving the newer shoots in the ground, or digging the entire group and saving the new rhizomes and discarding the old “mother plants” or any rhizome that is not healthy or soft.
It's a good idea to keep all plants carefully labeled when removing all the mass. You can use a waterproof pen to write the name on the leaf of the plant. After digging the lilies, divide them by cutting off the newer rhizomes with connected fans.When it comes to trimming foliage, we recommend doing this task after flowering is over and then trimming the foliage back to six inches. This will help promote air circulation and prevent overcrowding, which can lead to disease problems due to lack of air circulation.
To remove spent flower stalks from bearded iris plants, follow the stem to the base of the plant, where it meets the rhizome (the thick, fleshy, root-like structure) and trim it with sharp pruning shears. Iris borers (Macronoctua onusta) are a species of moth larva that feeds on the rhizomes of the bearded iris.We didn't do anything to amend the soil when planting our irises; we simply dug a trench with the garden tractor, put them in the trench and kicked and pushed the soil over them. That said, you should still cut the spent stems of iris flowers to keep them tidy and prevent botrytis and other diseases. Gardeners can avoid many problems by providing good drainage to prevent their irises from getting wet with their feet.We recommend dividing your irises after about 3 or 4 years, as they get too full.
The iris needs space to grow new plants. If there are a lot of people, they will not be able to divide and flowering will suffer or stop.In conclusion, when it comes to pruning potted iris plants grown in Minnesota, it's best to divide them 6-8 weeks after flowering season (usually July or August). Trim foliage back to six inches after flowering is over and cut spent stems of iris flowers for tidiness and disease prevention. Provide good drainage for your irises and divide them every 3-4 years for optimal growth.