Combine the boiling water and lavender in a medium bowl; cover and steep 30 minutes. Strain the lavender mixture through a fine sieve into a bowl; discard lavender leaves.
Combine 3 cups water and sugar in saucepan. Bring the mixture to a boil, and cook 1 minute or until sugar is dissolved.
Combine lavender water, sugar syrup, and lemon juice in a pitcher. Cover and chill.