I really don't pay attention. I don't notice new hybrids very often (because they're mostly on my beach and I never go down there). Thanks to the Beautiful Town Ordinance I don't even water my flowers.
More like how many hybrids do I attempt to grow a day LOL. At my sucky rate, about 0 to 1.
I'm currently trying to grow lots hybrids...I did a better job when I was just doing a pair of flowers a day, instead of doing 20 a day...
I have this section in my town just full of flowers trying to create hybrids, I water all of them and put them in diagonal and doing everything right (i think) I'll be lucky if maybe 2 hybrids come...and way more lucky if it's even the color I want >_>
I grow around five or six hybrids a day, depending on whether I managed to get to them the day before. I usually give them away to whoever is online on my friends list, because I don't need bright colours in a dark-themed town. That'd defeat the objective of the whole thing. =P
Not really bothering with flower placement and my villagers plant wherever they want. So mostly I get one to two every few day xD really don't know how to arrange the flowers to get any hybrids so mostly luck decides if there will be a hybrid