Instructions
Raise an Eligible Girl's Heart Level until she has 10 Hearts. You can do this by giving her gifts and talking to her every day. If you do these tasks daily, the Eligible Girl will have 10 Hearts after about one in-game year.
Speak to Stella and she will give you the Recipe Book for the Wedding Bouquet. Go to the Clock Tower and climb the Beanstalk beside it. Your character will have a short chat with a Whale. After the conversation, visit the Beach. You will find a Tide Cluster in the sand.
Keep the Tide Cluster in your Inventory. Go to Whale Island and your character will have another conversation with the Whale. Give him the Tide Cluster and he will give you Baleen. Talk to Ganesha and she will give you a White Rose. Go to your home and toss the White Rose into the Seed Maker to create White Rose Seeds.
Plant the White Rose Seeds in a dungeon or in your Field during Spring, Summer or Fall. Water the seeds until they mature into a White Rose. Instead of harvesting it, leave the White Rose in your Field. After three days, the White Rose will become a Blue Rose.
Go to the Green Cave in "Rune Factory: Frontier." Pick up one Green Grass. Buy Toy Herb Seeds, Pink Cat Seeds and Moondrop Seeds from Materia. Plant the Toy Herb Seeds in the Green Ruins and harvest one Toy Herb. Sow the Pink Cat Seeds in the Green Ruins to grow Pink Cats. Use the Moondrop Seeds to grow Moondrops on Whale Island.