In a large pot bring spinach to a boil on high. Boil for 1 minute. Remove and drain. Mince.
In a small pot heat butter on medium. When butter is melted, add garlic and stir. Then add flour and stir. When the flour blushes after 1 or 2 minutes add spinach and stir well. Add milk, then stir again. Bring to a boil stirring frequently. Boil for 2 minutes and remove off heat.