Bring 2 cups water and sugar to a boil in a medium saucepan. Stir until sugar is dissolved. Remove from heat; stir in flowers. Cover, and let steep for 1 hour.
Fill a large bowl with ice and water; set aside. Strain syrup, and discard solids. Chill in the ice bath. When cool, stir in lime juice, lime zest and tequila.
Freeze mixture in an ice cream maker. Transfer to a container and store in the freezer.