The ideal pH for irises is 6.8 (slightly acidic) but irises are quite tolerant of less-than-perfect soils. Gypsum is an excellent soil conditioner that can improve most clay soils. ![]() ![]() If you have heavy soil, adding humus – compost – or other organic material – will improve drainage. Good air circulation is essential and water should not stand in the beds.īearded irises will thrive in most well drained soils. A raised bed or planting on a slope are ideal places to plant iris. Iris will grow in deep shade, but probably not flower. Some afternoon shade is beneficial in extremely hot climates, but in general irises do best in full sun. Irises require at least a half-day (6-8 hours) of direct sunlight. ![]() Plant your iris at least four to six weeks before your first hard freeze or killing frost. It is important that the roots of newly planted irises be well established before the end of the growing season. This is also the best time (plants are normally dormant during the heat of July and August) to divide and replant iris that have become overcrowded, usually after three to five years. For best results, plant iris rhizomes in July, August or September.
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