Table of Contents
What is the best mulch for irises?
Various types of organic materials are appropriate as mulch, ranging from the widely available but potentially unsightly dry grass clippings or shredded leaves to shredded or chipped bark and wood materials, pine straw, pecan hulls and others.
Should you mulch an iris bed?
Unlike bulbs, which thrive deep underground, iris rhizomes need a bit of sun and air to dry them out. If they're covered with soil or crowded by other plants, they'll rot. Irises may benefit from shallow mulching in the spring. Taller irises may need staking or they will fall over.
Can I mulch around bearded iris?
Bearded iris need good air circulation. Plant them a minimum of 16 to 18 inches apart (less space for dwarf irises and more for tall bearded iris varieties). Do not mulch. Mulching helps the soil retain moisture, and too much moisture will cause the rhizomes to rot.
What makes iris leaves turn brown?
Leaf spot is a common disease of iris, especially rhizomatous species. It is caused by the fungus Didymellina macrospora. The first evidence of the disease is the appearance of small yellow-brown spots on leaves that are surrounded by a water-soaked border. The spots enlarge, turn brown and dry.
Can I use preen in my iris bed?
It won't kill the weeds already there. I have used Preen for years without a problem with Iris and daylilies.
How do you get grass out of iris?
How do I winterize my irises?
Do I need to cover irises for frost?
Keeping the roots protected is essential in protecting the plants from frost. If the shoots are small enough, you can cover them with mulch as well to protect them from frost.
When should iris foliage be cut back?
Iris plants are best cut back in the fall. Spent flower stalks can be removed in spring after the plants finish blooming, but the foliage should be left standing through summertime. In mid-autumn, cut the leaves back to about 3″ long above the soil line.
What fertilizer is good for irises?
Fertilization. Irises should be fertilized in early spring about 6 to 8 weeks before bloom, and again after the blooms are gone. Because phosphate is important, we recommend bone meal or super-phosphate and a light balanced fertilizer such as 10-10-10 or 6-10-10 depending on the amount of nitrogen in your soil.
What is the best time to transplant irises?
The best time to plant and transplant rhizomatous iris is late July through September. Iris loves the heat and drier weather of summer and the summer dividing will reduce the incidence of bacterial soft rot. Most rhizomatous iris should be divided every three to five years.
Why are my iris leaves falling over?
Flopping iris indicate it's time to divide the clump, especially if this has not been done within the past three years. Iris also will fall over if they are growing in too much shade or if they have been over-fertilized with a high-nitrogen mix that will spur foliar growth at the expense of flower development.
Why did my purple iris turn yellow?
Occasionally, we hear that an iris has changed color. There are several possible reasons why an iris flower loses color, but it generally doesn't change color entirely. Temperature changes, chemical drift, transplant issues or even a random rhizomes dug up by a dog can cause a stand of iris to change color.
Why are tips of iris leaves turning yellow?
Yellowing iris leaves can be caused by overwatering, underwatering, root rot, incorrect soil pH, too much fertilizer, lack of fertilizer, wrong type of fertilizer, lighting issues, diseases, or pests. Identifying the problem and quickly correcting it typically results in fresh, healthy new growth.
How often do you water iris?
Water generously after planting.
If conditions are dry, water every 7 to 10 days or as needed during the morning or evening. Assuming you planted your irises in the late summer or early fall, you may stop watering your plants as soon as the weather cools and it begins raining or snowing.