Bring two cups of water to a boil. Whisk in sugar until dissolved. Remove from heat, stir in lavender, add a few berries, and let it sit for 15-20 minutes.Strain lavender-sugar water and let it cool in the refrigerator. You can speed this up by using a shallow pan for more surface area.In a pitcher, combine lavender sugar water, lemon juice, and 4 more cups of cold water.Serve over ice with a lemon wedge garnish and a pinch of lavender buds if desired.