Soil temperature: 72 - 75 degrees fahrenheit
Iris will grow in zones 3-11 and prefer moist roots. We grow them in our test gardens, and water them like all our other flowers, and they profusely flower from late March to May and provide dark green foliage until your first hard frost in the fall. In the fall their leaves will brown where here in zone 7 we cut them back to the ground in late November. Seed are easy to germinate but your plant will not flower the first year. Once grown they are easy to subdivide and create new plants. They do need a cold spell to germinate so if you live in zones 8-11 you should place in your refrigerator in a bag with soil or sand for 8 weeks before planting (vernalization).
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