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..
Plant Them Right. Irises need full, all-day sun to grow and produce blooms. Too much shade can prevent flowering, so make sure you choose a bed that isn't shaded by buildings or trees. An area with well-drained, slightly sandy soil with a southern exposure usually provides the best area for successfully growing irises.he Right Fertilizer. Irises don't generally require any fertilizer after they are planted, but you can fertilize lightly after flowering if they bloomed poorly. Too much nitrogen-rich fertilizer results in abundant and healthy leaf growth but few flowers.