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..
1 Plant iris in mid-to late summer. 2  Bearded irises have rhizomes (fleshy roots) that should be partially exposed, or thinly covered with soil in hot climates. 3  Plant rhizomes singly or in groups of three with the fans outermost, 1 to 2 feet apart, depending on the size.e would not mow the iris foliage nor cut it back until after it turns brown and is dead. The bulbs are storing energy for next year so you want the leaves to nourish the bulb. After the leaves brown, they should just fall off. It's not pretty for a while but the beds largely take care of themselves.