Wow, Joanna--my Picasso petunias are growing like crazy in my garden. I can't believe how they are blooming non-stop with the goofy weather we've been having. I planted 4 plants (from 4" pots) into a 16" container, and it is awesome! Mine are growing in coconut coir, which if I remember correctly has a ph of ~6.5.
Will try to get a photo tomorrow. Even with all of the rain we've had here (last month one of the wettest on record), these plants have kept going.
