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May 30, 2018 3:01 PM CST
Name: Jerry
New Jersey (Zone 6a)
Hi Folks, from your experience, do Iris flowers open during the day or at night?
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May 30, 2018 3:19 PM CST
Name: daphne
san diego county, ca (Zone 10a)
Vermiculture Million Pollinator Garden Challenge
hi jerry. do you mean fully open? or start to open from a tight bud?

mine start to pop open in the cooler hours of the early morning or hours close to midnight. but, they don't fully relax until there's some warmth of the day. sometimes, if the iris are a complex flower with many ruffles or lace, they have taken a-day-and-a-half to fully relax. anyway, that's been my two year experience in southern california.

whereas, when i lived closer to san francisco it seemed to be overnight. however, iris forms were simpler then, and not as many frills and ruffles.?? just seems to me imho.😀
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May 30, 2018 4:52 PM CST
Name: Robin
Melbourne, Australia (Zone 10b)
Region: Australia Garden Photography Cat Lover Irises Seed Starter
That's a good question. I've had blooms open during the day and night and I couldn't tell you which is more likely.
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May 30, 2018 4:56 PM CST
Name: Bonnie Sojourner
Harris Brake Lake, Arkansas (Zone 7a)
Magnolia zone
Region: United States of America Region: Arkansas Master Gardener: Arkansas Irises Plant and/or Seed Trader Moon Gardener
Garden Ideas: Master Level Dragonflies Bulbs Garden Art Celebrating Gardening: 2015 Gardens in Buckets
Most of mine open during the day. I can tell the evening before if a bloom is ready to 'burst' and in the morning one or some of the falls are loosed and the process begins. The newer more ruffled irises usually do not fully relax the first day so a second day bloom is the best for a photo..... if one can wait.
Thro' all the tumult and the strife I hear the music ringing; It finds an echo in my soul— How can I keep from singing?
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May 30, 2018 10:25 PM CST
Los Altos, CA (Zone 9b)
Irises Region: Ukraine
Mine open in the early morning. Sometimes I can watch the falls drop.
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Jun 1, 2018 4:04 PM CST
Name: Jerry
New Jersey (Zone 6a)
Thank you all for your input. I guess that the accurate answer would be that Iris open their flowers both at night and during the daylight hours based upon the variety. I have had three open over the last four days with 'Tennison Ridge' and 'Magical Encounter' opening at night and 'Hello Darkness' opening throughout the daylight hours. Now, I wonder if the same variety would change when it opens it's flowers when grown in different parts of the country and differing growing zones?
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Jun 1, 2018 4:31 PM CST
Moderator
Name: Kent Pfeiffer
Southeast Nebraska (Zone 5b)
Charter ATP Member I was one of the first 300 contributors to the plant database! Plant Database Moderator Plant Identifier Region: Nebraska Celebrating Gardening: 2015
Million Pollinator Garden Challenge Forum moderator Irises Garden Sages Garden Ideas: Master Level
Unlike some other types of plants, time of day has no impact on the opening of iris flowers (beyond the fact that, usually, the warmer it is the faster they open which might make them a bit more likely to open during the day, but again, it's a temperature thing not a day/night cycle thing).
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Jun 22, 2018 11:30 PM CST
Name: Daisy
close to Baltimore, MD (Zone 7a)
Amaryllis Plant and/or Seed Trader Region: Maryland Organic Gardener Irises Herbs
Hellebores Growing under artificial light Container Gardener Cat Lover Garden Photography Bulbs
Speaking of "burst" or "watching the falls drop", yes if the time was right I have seen iris blossoms unfurl right before my eyes. It's a most marvelous thing to see!
-"If I can’t drain a swamp, I’ll go pull some weeds." - Charles Williams
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Jun 23, 2018 10:27 AM CST
Name: Evelyn
Sierra foothills, Northern CA (Zone 8a)
Irises Region: Ukraine Garden Procrastinator Bee Lover Butterflies Plant and/or Seed Trader
Region: California Cat Lover Deer Bulbs Foliage Fan Annuals
Daisy ~ Welcome! to the Iris Forum! Hurray!
"Luck favors the prepared mind." - Thomas Jefferson
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