Can you help me understand this Law question?

Bob and Joe have been neighbors for thirty years. Twenty-five years ago, Bob planted a rose garden that extended onto Joe’s property. Each year, Bob would work openly in the garden, making sure that the roses would flourish. On several occasions over the years, Joe would comment on how beautiful the rose garden was. Since the garden was planted, there has been a prominent sign, on Joe’s property, saying “Bob’s Rose Garden.” Now, Joe objects to Bob’s garden on his property. Under the doctrine of Adverse Possession, does Bob now own that land? Fully discuss the doctrine of Adverse Possession and whether it applies here. Support your argument with citations to supporting sources .