zenideas

Weeding the mind garden is a necessity to remove at first unwanted negative thoughts and then in fact any thoughts at all. One may do this in many ways.
Meditation is one. Not necessarily formal meditation. Gardening for example can be seen as a form of meditation.
One way to do weeding is to light a little flame and making it larger in the mind then use it to burn away the unecessary thoughts, just as one might use a flame to burn weeds in the garden.
Establishing a light in the mind is of importance.
Using correct, subtlely placed, lighting at night in a Zen garden can be a very calming tool.
Herein lies the cultivation of your garden.