The listing, Iris Flowers Mix Seeds (10) SASE has ended.
Iris seeds can be planted at any time, but the best time to plant the seeds is during the fall/winter/ and VERY early spring months.
First, soak the seeds in water (using a pudding bowl, cup, or similar) for at least 48 hours up to 2 weeks. Change the water out daily using a strainer to catch the seeds (so as not to lose any). No nicking is necessary. Soaking will cause these shriveled up seeds to plump up as well as to remove the inhibiting factors within the seed so they will germinate more easily.
Next, plant the seeds about a half inch deep and preferably at least a half inch apart. In a regular 'one gallon container' plant no more than 20-25 seeds.
Some people prefer to sow the seeds directly into the ground in the fall/winter, and let the natural cold of winter and nature itself wash the inhibitor factors out of the seed. And that will work too. Due to the fact that some varieties of seeds NEED several weeks of cold weather outdoors to germinate, makes it advisable NOT to plant them in late spring/early summer or summer months.
NOTE: Iris seeds will germinate for up to 18 years. That is how they survive in the wild. So, if you want to wait & save some of your seeds for next year.Once planted in the fall or winter - germination of the seeds will take place the following spring.
Depending on climatic and growing conditions the seedlings (once sprouted) can produce "maiden bloom" for the first time in the spring of the following year, if not then surely by the next spring. Commonly warmer climates will see "maiden bloom" the first spring after they have sprouted; in cooler climates usually 2 years after they have sprouted.