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..
Trim out any dead or badly damaged leaves. Cut these back to the base of the iris or trim off dead leaf tips if most of the leaf is still green. Prune back the entire iris plant to within 6 inches of the ground after the foliage begins to yellow in fall. Remove the old foliage from the bed and dispose of or compost it. 4. Spread 2-inches of mulch over the iris bed after trimming, if these are first year plants or if your area experience winter freezing.