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..
The best time to cut iris from a flower bed is early in the morning or late at night when it has had a chance to recover from the heat of the day and fill with moisture. Pour warm water at 100 degrees F. into a 14 quart to 2-1/2 gallon bucket until it is half full and mix in 50 grams of floral preservative.