Considering that villagers water flowers too, can they breed hybrids? I sometimes see a hybrid near flowers I didn't water for the day, and I do see my villagers watering flowers quite often (I have the beautiful town ordinance).
Somehow yes because the villagers plant the flowers that can spawn the hybrids and they can water them. For example they plant a red cosmos next to a white one and the next day a pink hybrid spawns c: It?s a nice surprise.
With beautiful ordinance on it actually happens more than I expected. When villagers plant flowers they tend to plant the same type close enough that wen watered, hybrids could form.