how long to cook collards greens
1 Bring to a boil and then reduce heat to simmer for about 20-30 minutes. 2  This helps the broth take on that delicious, smokey flavor! 3  Add in the collard greens. 4  Cook on med-low heat until tender for about 45-60 minutes. 5  You can increase the heat if needed but do not boil the collard greens. you want to slowly steam cook.