Dracaena Marginate (Dragon Tree Plant) leaves falling off

It is an easy plant to grow, in either a sunny, though not in direct sun, or shady spot in the house. From spring to summer feed every two weeks with a balanced liquid fertiliser and then sparingly in winter. As with all dracaenas, D. marginata makes an attractive, evergreen foliage plant for indoors. It is susceptible to red spider mite so check the underside of leaves for mottled brown patches

Thanks for that Ken.