i have planted 6 petunia plants in a rectangular plastic box with dimensions: Length=11 inches,width=7inches & depth=5 inches. The plants are still babies but they have filled the container. Will it we o.k if i give it lots of water and fertilize it well when they grow bigger. Are 6 petunias too many in this container. Below is the picture of how it looks..... I have 2 such containers with 6 petunias in each

thanks!