Remember, plants need attention. You cannot just stick them in the ground and expect them to survive with no help from you. During last year's dry times, I know of landscape personnel who were driving around to check on jobs they had recently done. Dismayed to see people were not watering their plants, they left notes on front doors reminding people that plants need water when there is not adequate rainfall. Those plants were under a one-year warranty but negligence is not a fair reason to expect a garden center to replace them.
Plants are an investment in time and money.
Their return is tenfold, giving us beauty and a healthy environment.