At least one year or more but under two years definitely. To be precise, the event which has her was during Oct 3 to 17 this year. So yeah.
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You got plenty of time for that. I wish I could commit but I want to collect more girls in between.
So do bloomed forms get an extra H-Scene or something? Why was there another Alpinia scene in that Danbooru folder?
Yes, they get a second affection meter with new affection items to boost them and everything.
Daisy's second h-scene is adorbs. And lewd, of course.
Not exactly tied in but additionally from Bloomed forms, you will also able to reset your maxed heart girls and able to bribe them with another set of (new and different)gifts as well. The mechanics is still the same. Get them to another 100% to unlock second H-scene.
EDIT: Haha, ninja'ed.
The h-scene is added alongside the bloomed form, but the affection and flower gems are available for every character regardless of evolution.