Jane has been hired as a gardener for a millionaire who has rare plants. The rarest of these plants is the Arid Water Bloom. This plant needs to be watered once a week and given exactlt four gallons of water. And more water or any less water will kill this rare plant  which means Jane is out of a job. As she goes to water the plant for the first time she notices that there are only two water jugs; a five gallon jug and a three gallon jug.  Using these two jugs, how can Jane give the plant exactly four gallons?