It isn't a huge stretch of the imagination that each member of the TNG crew is responsible for the care and upkeep of their own quarters.
In DS9: The Assignment we learn that Miles has killed his wife's plants by over-watering them.
And on at least one occasion (TNG: Sub Rosa) we see Beverly cutting and arranging flowers that she's evidently grown in her quarters.
In VOY: The Black Shore (Pocket Books) we find Captain Janeway watering the plants in her office on Voyager.
"Morale again?" Janeway asked Chakotay. Her first officer had joined
her in her ready room for a private briefing. He waited by her desk
while she watered the decorative plants by the door. Thankfully, she
thought, it had never been necessary to ration water aboard Voyager; otherwise > her plants would hardly have stayed so green.
And in TNG: Sins of Commission (Pocket TNG) we find Deanna Troi watering the plants in her quarters on the Enterprise-D.
With that done, she changed from her uniform into a soft spider-silk robe. She watered her plants and thought about having more chocolate, but decided that would be too indulgent. For a while she just sat down at her dressing table, studying her unsmiling face in the mirror.
And of course, who can forget Data's creative way of watering the houseplants in the Ready Room in TNG: A Fistful of Datas?