I wish I could tell you.. Our "baby" is 7 - 8 months now and still avoiding greens whenever possible. I've resorted to the "moving salad" where I place small bits of greens over her phoenix worms, and she gets a few that way (although she tends to give me the stink eye whenever she happens to down one unwittingly :x ). Other than that, I stuff the crickets full of greens, continue to offer them to beardie regularly, and wait.
Honestly, it really depends on the beardie. Many, when younger are just very focused on growing i.e., protein only please and LOTS of it! :mrgreen: Our girl got a late start on the growth process (due to a poor
UVB light we'd been using), and while she is 7-8 months technically, she is only about 3-4 months in "adjusted" age. Some beardies take to veggies right off, other take awhile to develop a taste for them. Keep offering a variety of greens, veggies and fruit and hang in there.
Here is a link to a wonderfully compiled list of beardie foods
(do's and don'ts), that may be helpful:
http://www.beautifuldragons.503xtreme.com/Nutrition.htm
The best,
Em