[oilbagz]

>how do you find out whether your soil quality is still good enough?

The plants will tell you. But the answer always, always is: how good is your compost?

Until you get composting right, gardening can be very frustrating. But it all starts with a proper compost. You can fix almost any soil issue with composting techniques.

The curious thing about that, though, is that your compost, if its a house compost (based on output from your household) is only going to be as healthy as you, yourself eat. So that is a factor as well ..