The dirt surrounded by my garden is brown how can i create it black? ...

When do you typically cut put money on...
Answers:    Your soil is the color it is. It doesn't matter if it's red (like mine), brown, or black. Soil comes surrounded by many colors depending on where on earth you live, but they are all still soil and as long as it is properly amended later it should grow what ever you like. The individual possible way I can imagine of to get your soil black is to purchase it and you would enjoy to buy a lot.
Is at hand a particular source you want black soil and maybe we could be of more abet to you.
Good Luck
Is the orchid gone?
By putting down black dirt or painting it.