Whenever I try to hire the new NPC gardener, it says I must first have a garden, which I do in all the families that have tried to hire one. Anyone else with the same problem and/or solution?
Have you clicked on one of the plants to see if the Hire Gardener option is available? Or are you trying from the sims' phone menu? (I didn't pay attention to if it was on the phone, but it is definitely available when clicking a plant for me)