Make the world prettier, more fun, and exciting.
Use genetic engineering and/or special nutrients and/or lightwave length sensitivity, and/or combinations of the above (and more) to get plants and flowers having many and “unnatural” colors even withing one plant.
An interesting way to create a little fantasy.
Use small plants like certain types of cacti as a base for a fantastic depiction of a strange world. Populate the plant’s many parts with minuscule sculptures of people, buildings, etc.
No need to guess if you need to water it or if it needs some additives etc.
Have a small gadget that you can stick in your pot or garden near the plant. You program it with the kind of plant it is monitoring and using the built-in sensors it will continuously monitor the soil and show you on a tiny display what you need to do.