Originally Posted by Zenithale

Aaaaaaand, of course:

But I guess that's fine, RNG is certainly working as intended, the numberous times that "almost impossible thing" (= last/50) occurs is just bad luck, right?

More seriously, if I am not wrong, the probaility should be:
Probability = (1-1/50)(1-1/49)...(1-1/2)
And yet that's rather frequent.

I don't think the odds of all items are set at 1/50. I think it is more like any FG gacha where certain items have set drop rates and the blooms are relatively low. It's just that since the other items drop out over time you end up with a higher chance as you get further into the set.

I'm on reset 6/11 (7th page), about halfway through. But honestly, if you aren't wild about spending your stamina on this, then...stop. Unless you are planning on using the girl for something specific where you need her at full power, then if you're playing for long enough, it should be easy to pick up the missing blooms on the reissue (that's my plan for Monotropasturum and I do use her in my main squads). Otherwise you're letting being a completionist interfere with your actual enjoyment.
I'm doing it because some of the rewards are good enough for me to keep going, and I won't deny that it's stamina hungry. But I'll do the Geranium reissue, I may do a bit of purple dragons to evolve Apple, and I won't sweat it. Odds are good I can get to page 8 by sometime over the weekend and I'll evaluate then how much I want to spend on it stamina wise depending on the rewards.