Many plants take different foods to keep them green and growing right if you don't take care of them they can turn brown and than you have a big problem you gotta dig them out of the pots and throw all them you bought away now you gotta buy more for the empty pots with nothing but dirt in them so that's why it's best to do it right in the first place and take care of them by adding the food ingredients and keep them watered right so they can get bigger and stronger and you can sell them especially if people see them growing good