Azaell, you also have to keep in mind that your dragon is still a baby, and babies don't eat much of their salad. Mine never ate much of his salads until he was about 10 inches long (around 3 months old). Now he's about 5 months old and he eats almost his entire salad every day.
Also, if you're not watching him every minute of every day, you might not know he's eating some of his salad. He might just eat one little piece or two while you aren't looking, and you don't notice because it's such a small amount of what you originally gave him.