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Water your iris seeds and surrounding soil frequently enough to keep the seeds and soil constantly moist, but not soaking wet, from the time of planting through sprouting in the spring. Local rainfall and weather, planting location and soil texture will impact how frequently you need to water. Warmer climates with little rainfall and fast-draining soil will require more frequent, even daily watering. Cooler, rainy or humid climates with humus-rich or clay soils will require less frequent watering.
Moisten the seeds and soil slowly with a very gentle mist so as not to displace the seeds or disturb nascent roots. A hose attachment set on a mist or light rain setting will help to keep the seeds and soil in place.
Set automatic commercial mist irrigation systems to provide your iris seeds with a regimen of 10 seconds of active misting during each 15 minutes of sunlight or artificial daylight hours.

Iris in general and holds true for almost all types: Impervious seed coats. Shake in dry sharp sand or nick carefully with a file. You may want to soak overnight after nicking. All periods must be moist, with seeds in damp not soggy medium. In order - 70F for 4 weeks, move to 40F for 6 weeks, bring back to approximately 50-55F for germination which may be staggered over many weeks time.