Here are averages that might help you know how often you should change the air filter at home: Vacation home or single occupant and no pets or allergies: every 6-12 months Average suburban home without pets: every 90 days
Rating Newest Oldest. Best Answer: Cut off dead blossoms and dead bloom stalks when the iris has stopped blossoming, but don't cut back the leaves until they begin to turn brown in the fall. The leaves are needed to produce next year's blooms. When you do cut, leave a fan shape about six inches long. Feed your irises a teaspoon of bone meal every fall and when you replant. You can feed again a month before they usually bloom if you like, but they are quite tolerant of just one feeding..
Care for Winter Iris I have a couple types of iris plants and I either cut them back as they start to die in the fall or just wait and mow them over when they all have turned brown. In the spring they come back. Iris' are very strong and hard to kill. Good luck! I have read that you should let the leaves die down since all the nutrients will go back into the bulb for the winter. I usually wait until after a few good hard frosts here(Mn) and then the leaves can be easily (gently) pulled off.