Do you use fertilizer daily or only sometimes/not at all? What are your results on average?
How is your set up and how many flowers do you usually plant next to fertilizer if you use it?
Do you think that watering your flowers does the same as fertilizer, so it `d be an unnecessary item?
I find that fertilizer helps grow more hybrids, but it isn't necessary to grow hybrids. When I play day by day, I use fertilizer to grow extra hybrids, but when I rapidly time travel, I don't use fertilizer because going to Nook's to buy it and taking the time to bury it is not worth it when I could just time travel another day to get those extra flowers instead. I think even with fertilizer, you have to still water the flowers to get any hybrids from them. I find this 5x5 circular formation using 12 flowers and 4 Jacob's ladders (they are supposed to help produce more hybrids around them) below to be very useful for growing hybrids.
X = flower
O = empty space
J = Jacob's ladder
F = Fertilizer