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. Check the depth of the rhizomes because if they are planted too deeply, irises might not bloom. Unlike bulbs and corms, rhizomes are best planted just under the soil. In clay soil, half of the rhizome should be above ground.. Water irises every week after planting and during the first spring and summer. Also water irises after flowering each spring. If your irises are rebloomers, continue to water through summer if rain is lacking, until they bloom again.