FFO is a frequently asked question. I had to ask several years ago, too. I tried everything I could think of and couldn't come up with it. First flower open, hmmmm, I always said first bloom until I heard what is used online. It's not just on this site because I was on Gardenweb when I asked. I think it's a daylily term. ---------Ok, I went to AHS and it's on their list of terms. Here's a very useful site:
http://www.daylilies.org/ahs_d...
I have never paid attention to which plants were EV, SEV or dormant. I've always had some that bloom every year and some that didn't. I also have some that bloomed the first year and didn't bloom again until I repotted them last year. I'm anxious to see if they will bloom next year. My zone is 7a and we have a very wide variety of weather. from 10 below up to 108 one year. Usually it's a happy medium of about 20 to 102, with most cold days being about 40 and most hot days being about 95. But, then along comes the climate change of the past two years and we've had extremes both ways. I think that the different "season" or foliage type really comes into play when you are in zones 8 and above and zones 5 and blow. I'm like Dot, this is just "me" talking so take it with a grain of salt.
Blessings, Mona