Desert can be converted into a lush green land by planting Terrestrial plant, Mesophytic plant, Halophytes, Psammophytes.

Psammophytes are those plants which can easily grow on sand and gravel. So, plantation of these plants can convert a desert into lush green land. Xerophytes are drought-loving plants and can withstand water scarcity, while halophytes grow on saline soil. Thus, the correct answer is Psammophytes.