The 10-11 day number was taken from a comment about Bowl of Cream. I have also seen comments about Elsa Sass going over 2 weeks in a vase. I would imagine that their water was ice chilled and changed daily, so yeah, a bit of pampering.
Anyhow, most cut flower varieties are expected to go 6-8 days in a vase, less if they've spent some weeks in a cooler. I anticipate spending a lot of time experimenting with cutting times (leaving the bud as hard as possible while still having it open freely) for each variety so the end consumer gets the most vase life possible.
There is also a lot of advice about time of day to harvest, what to do with the stems once cut, how much foliage to remove, what to the add to the water, and so on. I've not yet done any of it and I intend to try any reasonable suggestions without a bias - and to hopefully form my preferred methods for getting the best results in a practical manner.
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