If you are looking for a low stress but patient side business then growing plants is one you can look at. But if you live in a house with limited space what type of growing will be worth your while? Growing and selling bonsai trees are one thing you can look at.
This is a simple business model, plant seeds and sell tree when its big enough. But there are some very important factors to consider here. 1. What type of bonsai are you going to grow? And 2. How big are you going to grow it before you put it up for sale? The larger and older the bonsai is the more valuable it is, but this does not mean that you cannot make good money selling young trees in large quanties. You have to find a model that works.