I have found that if a person decides on their own to water plants, they usually water either the roses or the potted plants, rather than the flower boxes. In this case, they get the watering can from a random location, usually inside the house or workshop, like under the table or bed, in the laundry room. It is only when I take them to the shed to get the watering can and direct them to water plants that they water the ones in the flower boxes.