The observed bloom time for a particular iris is affected by both its location and by conditions such as this and previous year's weather. Peak bloom time, for example when the most TBs are in bloom, is similarly affected by location and conditions. By gathering observations of either, we may be able to judge when would be the "best" time to visit gardens in a particular area. We have suggested gathering such observations under each cultivar (see Phenology). Here we offer a slightly different opportunity, gathering observations by location on one page to help people find when to see irises in particular areas.
Please enter your observations under the appropriate State to help us start. And please add any suggestions how to improve this.
Central Iowa, south of Ames April 15th first bloom of season is 'Ruby Locket', a SDB listed as midseason bloom. It has consistently been our first bloomer, probably partly due to a semi-protected location on the south side of the house. Previous years: April 2, 2012; May 11, 2013; May 5, 2014.
Lincoln: Bearded blooms started on April 15 with Red Heart (SDB) and Baby Baron (SDB) The next day, April 16, I had my first MDB Libation, in bloom. The most amazing iris to bloom this early is an unnamed Siberian iris I have had about 4 years. It started blooming about April 18 and is an almost electric blue, with numerous open flowers April 23. None of the other Siberians are even showing buds on April 23. Further observations on Region 21 website.
-- WayneMesser - 2015-04-22