I'm almost afraid to mention this in case it's a bug and this brings it to the devs' attention. But, um, i just planted some herb seeds in my garden in Lethensome Lift. I actually gasped aloud and startled my spouse! Who promptly went over to HIS house next door to see if he could plant some. And he could.
We have crop gardens in Groddle Heights.
Please, please, pleeeeeeeeeeeeeeeeeeeease let this be a new feature and not a bug.