A patient undergoing chemotherapy for lymphoma (cancer) was advised to get rid of the house plants in her home. what is the possible reasoning behind this suggestion?

Chemotherapy patients are advised against gardening, planting or any form of contact with soil. The soil in the pots is a huge source of bacteria and mold, which presents an unnecessary danger to the patient. Removing indoor houseplants and flowers are also advised because these items tend to shed mold in the air and can be a source of infection. It is also important to not keep cut flowers inside the house because the water in the vases can harbor infectious bacteria and can evaporate in the air and spread to the patient.