Especially suitable in Survival, when there are not enough flowers or in Skyblock
The farmer is a simple box, in the back wall is a thrower filled with bone meal. Lilacs, peonies, roses and sunflowers are placed directly in front of it on a grass block. Behind it is a clock (basic idea https://minecraft-bauideen.de/297-Einfache-Ein-Ausschaltbare-Clock ), only instead of the redstone torch, a lever is used to then turn the clock on and off. Only it is still too fast, so you have to add an amplifier.