A watering can lets you direct the water and control its flow. For certain plants or seedlings outdoors, a hose can be too strong and can cause damage. For an indoor garden with plants like succulents or cacti, a cup could make a mess. A long spout on a watering can helps direct the pour to the base of the plant for better watering without getting water outside of the pot. Different types of watering cans have various functions that help keep plants and flowers beautiful.