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To grow irises, start in the late summer by picking a spot with well-draining soil that gets 6-8 hours of full sunlight every day. Then, plant your irises 1-2 feet apart in shallow dirt, with their roots spread downward and their tops slightly exposed to the air.
Plant singly or in groups of three, 1 to 2 feet apart, depending on the fully grown plant’s size. Soak Siberian iris rhizomes in water overnight before planting, then set them 1 inch deep (2 inches, if the soil is sandy), 2 feet apart. Over a period of years, they will form clumps; divide when blooms get smaller and vigor declines.
Plant your iris at least four to six weeks before your first hard freeze or killing frost. Where To Plant Irises require at least a half-day (6-8 hours) of direct sunlight. Some afternoon shade is beneficial in extremely hot climates, but in general irises do best in full sun. Iris will grow in deep shade, but probably not flower.
Iris grows best in well-draining, fertile soil that is neutral to slightly acidic. Take extra care to make sure the soil is well-drained, as irises may rot if they soak in wet soil over the winter. Loosen the soil using a tiller or garden fork to a depth of about 12 inches.
Understanding the ideal planting depth for iris plants is crucial for their successful growth and blooming. Whether you are planting bearded irises, Siberian irises, or Japanese irises, it is important to consider the specific requirements of each type.
When you’re ready to plant, dig 5-6 inch deep holes for bulbs and 4-5 inches deep for rhizomes. Depending on your preference, you can plant irises in groups of two or three or in a single row. Just make sure the planting holes are 12-18 inches apart from each other.
When planting iris bulbs, the general rule of thumb is to plant them about twice as deep as the size of the bulb itself. This means that for a typical iris bulb, you should plant it about 8 inches deep.
The American Iris Society website says to plant rhizomes "at or just barely below the surface of the ground. Irises should be planted so the tops of the rhizomes are visible and the roots are spread out facing downwards in the soil.
Are you wondering how to plant irises correctly so they thrive for years to come? Catherine, Horticulturist for Colorado Yard Care, demonstrates how to plant iris rhizomes at the correct...
But how deep do you plant iris bulbs exactly? Plant the bulbs in holes 4” deep and 2” - 4” apart; for larger groups, dig out a trench, position the bulbs, then replace the soil and water them well.