How to Grow HybridsTo make a hybrid flower grow, you have to put two flowers of the same variety (such as two roses, or two cosmos, etc.) next to each other. There is a small chance that a new flower of that type will appear next to them. A new flower can only appear if there are empty spaces next to the pair of flowers. The new flower might be a unique color that can't be purchased in the garden shop and can't randomly appear in your town.
Increase the Likelihood of New FlowersThe following actions might improve your chance of having new flowers appear:
•The orientation of your flowers might have an effect. In previous Animal Crossing games, having the flowers touch diagonally was better, but in other games, having them in straight rows was better.
•Water flowers even if they don't need it
Plant large patches of the same type of flower to have multiple flowers next to each other
•Bury fertilizer next to the flowers. Fertilizer is available after you upgrade Timmy and Tommy's shop to the Department Store.