I don't know where you keep you're garden, but personally I'm keeping mine in the greenhouse in my Royal Estate (the big MB house).
I have learned a few things about making this space more efficient.
Use pots not plots.
When you make a plot (of whatever size) in your greenhouse rows, you only have enough room for one row.
However, you're greenhouse rows actually have room enough for two side-by-side pots!
This is also true of the small sized pots as well.
Of course if you want to be really efficient you'll arrange you're pots in a hexagon or something. I haven't really explored that yet. For now, keeping my garden confined to my greenhouse is just right for me.