This planet is an exquisitely arranged and interconnected system. What's controlled in one place is going to have consequences in another place. Our job as gardeners is to try and figure this out no matter how small our allotted space might be. Discipline has to be the watchword for our controlling hands. It means not gardening without thinking of the garden as a habitat: for mice, for squirrels, for bees and wasps. For other living creatures beyond ourselves.
The longer you garden the better the eye gets, the more tuned to how colors vibrate in different ways and what they can do to each other. You become a scientist as well as an artist, with the lines between increasingly blurred.