One lonely tree in the middle of 3 acres will not do. Acreage horse owners should consider constructing a three sided shed or a wind fence if there is limited natural shelter available. The activities you participate in with your horses will determine in part what kind of shelter will be required. More intense activities such as horse shows may require a barn be built. This is not a necessity for horses being used for occasional riding.
Health care is another item of concern for the horse owner.
Of major concern is parasite control. Horses which are kept in close confinement are far more susceptible to problems with worm infestations. Keeping the manure cleaned up, not feeding on the ground, and setting up a worming program are all important parts of control. A proper worming program should be set up with your veterinarian who will know your situation and be able to advise you on frequency of worming and products to use. The last concern of the acreage horse owner is exercise.