My husband has Lewy bodies dementia. He also had a silent stroke which weekend his right side. He used to love working in the yard, mAintaining the landscape and growing vegetables. His balance is very bad now and he cannot keep his balance on the uneven for ground in the yard. His right side is weak and he falls easily. He feels useless, what type of outdoor work can I give him to do to keep him happy and help him to feel usefulness?