Dawntree Dragons are not only dragons born from eggs, but also spiritual saplings of the Dawntree on your Island! They are very close to their mother root. Treat an incubating Dawntree Dragon egg as an extension of your Dawntree: keep it nestled in the shade of its branches, and nestle it on a bed made of Dawntree leaves.
As the Dawntree Dragons grow, leaves begin to sprout from their branches. The leaves reach out toward the morning sun, soaking up its rays. While Dawntree Dragons do get some of their nutrients this way, they need to be fed fruit like any other dragon.
Don't worry about leaving Dawntree Dragons out in the rain; they never get moldy! Their bark - I mean, skin - is also fairly tough, so it can withstand the force of termites and woodpeckers.
Epic Dawntree Dragons are, in essence, flying Dawntrees. Just by flying to another Dragon Island, it can create a New Dawn, and allow white dragons to be bred there. Charitable Dragon Caretakers are known to take their Epic Dawntree Dragons on tour, where their benefits can be shared with everyone.