For best results: Prior to planting, be sure to soak seeds in water for at least 48 hours. Aim for 3-5 days, but no more than 2 weeks, changing the water daily.   Iris seeds require cold stratification - they must  go through at least one freeze-thaw cycle in order to germinate during the spring growing season. This can be achieved naturally, by planting outside prior to winter for blooms the following spring or in the refrigerator: Spread seeds on a damp paper towel. Roll the paper towel with the seeds inside and then wrap it in another dry paper towel. Place the wrapped seeds in a plastic bag, then seal the bag shut. Place the plastic bag in the refrigerator for at least 60 days.

The process of growing irises from seed can be a rewarding experience. While it takes longer to see blooms compared to planting rhizomes, growing from seed is not only cost effective but introduces more variety, unlike iris rhizomes which are a copy of the parent plant.