The Gardener Is Adding Fertilizer to Water to

The gardener is adding fertilizer to water to
-The gardener is adding fertilizer to water to encourage plant growth. The fertilizer label states, "Add 2 tablespoons of fertilizer to 1 gallon of water." The gardener's watering can holds 2 gallons of water, and he can only find his teaspoon for measuring. How many teaspoons will the gardener add to the watering can for the correct fertilizer dilution?
___________teaspoons