and watch them cry because you've asked them to develop an entire system for an engine they're not trained in or fluent with.
I support instanced gardening. I'd propose a "greenhouse" entrance in each city that was supposedly the city garden. giving everyone access to an instanced 8 space gardening plot (I'd love more but lets start small) perhaps purchaseable for a similar fee to a apartment or private room in a FC house. It could be a small room with a glass ceiling and door, displaying further other individual greenhouse rooms fading into the distance through the door (just to show it's one room out of many).
I have other ideas as well about an instanced "hangar" for FC's without a house to launch airship missions from. But I'll stop since this is about personal gardens.