Soil amending

Hello in my opinion leave it like this because if you add plants where the clover is your older plants will make too much shadow for your new babie. More it is not good to put too much plants in the same contener because each plant needs a lot of space for roots and if there is not enough space they will struggle and suffocate. It will be better to put your new plant in an other contener. Now if you want to try you can but you will have to look that newer plants got enough light and space for roots. Good luck. Peace