How many Petunias do I need for my planter or hanging basket?

[@colleenlill6819]

what is the difference between a durabloom petunia and a supertunia?

[@LaBelle22]

I think my bakery is about 10” and it’s my first time so I only planted one in each hanging basket. Is there any way to get them in full bloom ?

[@denise4649]

How many plants do you recommend in a 24” rectangular railing planter?