Do y'all have any luck growing petunias?

This is what you do. Once a week during the growing season, pick the longest stem and cut it back by half. By staggering the time and cut of the stem you should have a full bushy plant all summer. Don't forget to water real good, 'tunias are really thirsty, sometimes I have to water twice a day, when it's hot and sunny. If this sounds like too much work, then cut back on fertilizer. I also rotate the whole pot for even growth.