(Apologies to Kristen whose submission was lost until today!)
Location: Morningside Heights
Size: 2 indoor windowsills, plus some other places Favorite seed
Favorite Resource: grocery store fruit
"I don't have any outdoor space to grow plants, so I've used the living room and kitchen windows for my plant laboratory. In the living room, the windowsill has (left to right) strawberry guava, calamondin, lychee, calamondin, lychee, calamondin, and avocado....." [more below]
The strawberry guava was purchased from Gurney's online, and the lychees came from pits from fruit I ate. The calamondins come from the seed of a single ripe fruit that fell off of an expensive plant at a nursery (I asked if I could take it home with me). If you don't find a stray calamondin fruit, kumquat seeds grow just as fast. The avocado pit was donated by a friend.
This is a very dark corner, but the plants grow fine.