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The best time to move iris is six to eight weeks after they bloom. Division and transplanting can be done at the same time. I would try to flag them now with some type of marking system while in bloom so that you know what you are moving later.
If so then your zinnias will bloom approx. 4 weeks after you plant them outside. If you use method 1 zinnias will bloom 6-8 weeks after the seeds are planted. But if you use method 2 they will bloom 4-6 weeks AFTER they are transplanted outside depending on the weather and their growing conditions.