We can tend our animals from afar, so why not our crops as well? There is almost nothing I find more frustrating than returning to my house 12 hours after planting some crops only to discover that they needed to be watered one more time before they could finish growing. So I was thinking a nice little irrigation system would totally do the trick.
And perhaps further, an auto-harvester and auto-planter? As with our animal related automation, these would be machines with a limit on total capacity, so your garden wouldn't become infinitely automated.
But PS to the devs - you should make the Beekeeping skill first. :) *desperately wants to be an apiarist*