The rainforest is filled with a prodigal variety of vegetation.
or more rarely:
abundant (extravagant in amount)
or more rarely still:
long absent (someone who has been away a long time)
More rarely, prodigal is used as a noun as a shortened version of prodigal son to reference someone who is wasteful like the prodigal son in the famous Christian parable. When the prodigal son came home and apologized for his wasteful and ungrateful ways, his father forgave him, loved him, and celebrated the return.