An exciting new area of Irises are the rebloomers. Traditionally most Iris species have bloomed in the spring. Hybridizers soon noticed that some will rebloom in the fall. Various species have shown this tendency. Iris bicapitata which until recently has not been in collections has been said to start blooming in the Fall and continue until Spring. Of course that type of continuous bloom would only occur in milder winter climates. New hybrids of tall bearded Irises have demonstrated am ability to rebloom farther north before winter and some varieties may rebloom more that once given the right conditions.
All gardeners could contribute substantially to our knowledge by adding notes to the comment section of any of the cultivar pages on this wiki. Record date (Day, Month, Year) of bloom and the location of where they were growing. The wiki could add substantially to the data we have and help hybridizers choose parents for developing rebloom and even continuous bloom of cultivars for their region. For more information about reblooming Iris join the Reblooming Iris Society a section of AIS.
Different geographic areas have different star rebloomers. Below is a list of varieties by color that have proven themselves reliable rebloomers in Region 4 which consists of the states of Maryland, North Carolina and Virginia.
By doing a search for "rebloom" within the text you can generate a list of rebloomers. This does not account for those where "re-bloom" is used and those where the code RE was used as not all instances of this abbreviation have been written out. Unfortunately the RE also appears in words so you must include a space on either side to find these. also a period after the RE or Re may complicate the search hopefully ALL abbreviations will eventually be eliminated so that a simple search would give complete results. Because the verbiage needs to be standardized, searches do not work as well as they might.