The seeds cost 85 coins to plant, and can be harvested every sixteen hours for 220 coins. They also award 3 XP per plot. However, the seeds must be bought in packets of 50 within the Greenhouse until the second level of mastery has been acquired on it.
Harvesting Lilac Daffy has a 10% chance of yielding Perfect Bunches, which could be used as a decoration. Lilac Daffy lived up to 14 days in a perfect bunch and could not be sold.