We consider these all our  staple vegetables  for all our  bearded dragons! 
Meaning you can serve this combo every day.
Mustard greens-  a great  source of calcium, vitamin C, folate and dietary fibre.
Chopped dandelion greens -  are an excellent source of vitamins A, C, E, and K. Additionally, the leaves contain folate and small amounts of B vitamins. As for minerals, the leaves have a high amount of essential minerals that includes calcium, magnesium, potassium, and iron.
Collard Greens - They are full of calcium and contain decent amounts of vitamins A, C, and K. Your bearded dragon should be eating a variety of greens regularly, and collard greens are among the ideal greens for your lizard’s diet.