Have you received lately a Lighthouse Cove quest saying that Brenda needs some help? It seems this is a semi FarmVille quest that most of the requirements are mastering some crops. This is more likely a two set quest and and may depend on what will you receive. Each quest has 3 tasks involving Brenda a Lighthouse Cove mainstay. If you receive this quest here are guide to help you with it. Note: You have 10 days for each quest, so this may run for 30 days.
Cove Cultivations Quest 1: FarmVille Back to Cove Basics
Harvest Horse Paddock 4 Times (skip 30)
Master Clover Crop to 2-Stars (skip 10)
Info: 4 hours to grow and harvest and will take a total of 10,000 clovers to achieve level 2 star Mastery.
1 Unwither, 100 xp, 2500 coins