Again- I am new to gardening. Their roots are not even established yet they were planted so recently. I am gonna wait till I know they are for sure established before doing anything. I have my mother and a gal from church who owns a big nursery helping me with this small garden. They only want me keeping them watered at the moment.
And trim flowers off of them whole, leave only the green stem, they look like grandiflora and those like to make seeds and die. So don't let them. Source - overwintered around 100 petunias
And that photo is from the day I planted them- so it may not be good yet to think about trimming. Which is why I moved them onto the porch so they would not flood in the storm