Its one of the softest maples. Dry is better than green as green burns at lower temps and can generate more creosote. As stated low btu compared to hardwoods. As long as your stove draws well it will burn and make heat. As mentioned mixed with some HW would be best. Use it as a starter and during the day when you can add to the fire and then at night bank hardwood. Since it is free and already on your place I would burn it.
