I had expected some form of garden to be involved with houses. Each Tier could have a larger one. Each Region could have its own specialties for growing.
So either certain Crops for certain regions or a decreased grow rate for them.
With options for Garden beds from Furnishing Crafters it could make houses feel more finished and give an option to get some of those harder to farm crops without having to buy them.
With land sizes it would be possible to start off with say a Herb bed on the Deck.
Then move up to outdoor beds when your house has a bit of a Yard. Could operate with the same limits as Chests.
Then you could use Saltpeter to make Fertilizer for the crops. One resource I always have too much to use of. Even make use of Water to Grow or Azoth Water to increase the Yield. Could easily have tiers of Fertilizer to scale the Yield too.
It could also work for Potion making materials for the lower end so Grey items can be obtained from gardens but better still requires manual harvesting.
With the revert to housing Taxes and alot of towns jumping from 2% to 10% it would make Houses that bit more worth it for the prices involved without damaging the economy.