Moon cat method
Use fruits like moon melons, blood bananas, celestiberry, or moon mangoes. Don't collect till the tranquil event is over. When it's done harvested, collect it and it will duplicate
2. Stegosaurus/Giant ants
Use any fruits and harvest it when the event is done, it should dupe. Stacking them should make it better.
3. Tranquil Shard
The shard makes mutates a pet and every 20-25 mins makes a plant tranquil, kinda a slow method.
4. Advanced Sprinkler
Advanced sprinkler sometimes gives you a gold mutation. When it has tranquil mutation with it too, it adds 2 points to it.
5. Butterfly
Butterfly can make plant rainbow, it adds 4 points to the plant.
6. Prismatics and Divines
Using prismatic and divine plants give you more points